Overview

Get the lowdown on the key pieces of Bootstrap's infrastructure, including our approach to better, faster, stronger web development.

HTML5 doctype

Bootstrap makes use of certain HTML elements and CSS properties that require the use of the HTML5 doctype. Include it at the beginning of all your projects.

<!DOCTYPE html>
<html lang="en">
  ...
</html>

Mobile first

With Bootstrap 2, we added optional mobile friendly styles for key aspects of the framework. With Bootstrap 3, we've rewritten the project to be mobile friendly from the start. Instead of adding on optional mobile styles, they're baked right into the core. In fact, Bootstrap is mobile first. Mobile first styles can be found throughout the entire library instead of in separate files.

To ensure proper rendering and touch zooming, add the viewport meta tag to your <head>.

<meta name="viewport" content="width=device-width, initial-scale=1.0">

You can disable zooming capabilities on mobile devices by adding user-scalable=no to the viewport meta tag. This disables zooming, meaning users are only able to scroll, and results in your site feeling a bit more like a native application. Overall we don't recommend this on every site, so use caution!

<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">

Bootstrap sets basic global display, typography, and link styles. Specifically, we:

  • Set background-color: #fff; on the body
  • Use the @font-family-base, @font-size-base, and @line-height-base attributes as our typographic base
  • Set the global link color via @link-color and apply link underlines only on :hover

These styles can be found within scaffolding.less.

Normalize

For improved cross-browser rendering, we use Normalize, a project by Nicolas Gallagher and Jonathan Neal.

Containers

Easily center a page's contents by wrapping its contents in a .container. Containers set width at various media query breakpoints to match our grid system.

Note that, due to padding and fixed widths, containers are not nestable by default.

<div class="container">
  ...
</div>

Grid system

Bootstrap includes a responsive, mobile first fluid grid system that appropriately scales up to 12 columns as the device or viewport size increases. It includes predefined classes for easy layout options, as well as powerful mixins for generating more semantic layouts.

Introduction

Grid systems are used for creating page layouts through a series of rows and columns that house your content. Here's how the Bootstrap grid system works:

  • Rows must be placed within a .container for proper alignment and padding.
  • Use rows to create horizontal groups of columns.
  • Content should be placed within columns, and only columns may be immediate children of rows.
  • Predefined grid classes like .row and .col-xs-4 are available for quickly making grid layouts. LESS mixins can also be used for more semantic layouts.
  • Columns create gutters (gaps between column content) via padding. That padding is offset in rows for the first and last column via negative margin on .rows.
  • Grid columns are created by specifying the number of twelve available columns you wish to span. For example, three equal columns would use three .col-xs-4.

Look to the examples for applying these principles to your code.

Grids and full-width layouts

Folks looking to create fully fluid layouts (meaning your site stretches the entire width of the viewport) must wrap their grid content in a containing element with padding: 0 15px; to offset the margin: 0 -15px; used on .rows.

Media queries

We use the following media queries in our LESS files to create the key breakpoints in our grid system.

/* Extra small devices (phones, less than 768px) */
/* No media query since this is the default in Bootstrap */

/* Small devices (tablets, 768px and up) */
@media (min-width: @screen-sm-min) { ... }

/* Medium devices (desktops, 992px and up) */
@media (min-width: @screen-md-min) { ... }

/* Large devices (large desktops, 1200px and up) */
@media (min-width: @screen-lg-min) { ... }

We occasionally expand on these media queries to include a max-width to limit CSS to a narrower set of devices.

@media (max-width: @screen-xs-max) { ... }
@media (min-width: @screen-sm-min) and (max-width: @screen-sm-max) { ... }
@media (min-width: @screen-md-min) and (max-width: @screen-md-max) { ... }
@media (min-width: @screen-lg-min) { ... }

Grid options

See how aspects of the Bootstrap grid system work across multiple devices with a handy table.

Extra small devices Phones (<768px) Small devices Tablets (≥768px) Medium devices Desktops (≥992px) Large devices Desktops (≥1200px)
Grid behavior Horizontal at all times Collapsed to start, horizontal above breakpoints
Max container width None (auto) 750px 970px 1170px
Class prefix .col-xs- .col-sm- .col-md- .col-lg-
# of columns 12
Max column width Auto 60px 78px 95px
Gutter width 30px (15px on each side of a column)
Nestable Yes
Offsets Yes
Column ordering Yes

Grid classes apply to devices with screen widths greater than or equal to the breakpoint sizes, and override grid classes targeted at smaller devices. Therefore, applying any .col-md- class to an element will not only affect its styling on medium devices but also on large devices if a .col-lg- class is not present.

Example: Stacked-to-horizontal

Using a single set of .col-md-* grid classes, you can create a basic grid system that starts out stacked on mobile devices and tablet devices (the extra small to small range) before becoming horizontal on desktop (medium) devices. Place grid columns in any .row.

.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-1
.col-md-8
.col-md-4
.col-md-4
.col-md-4
.col-md-4
.col-md-6
.col-md-6
<div class="row">
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
  <div class="col-md-1">.col-md-1</div>
</div>
<div class="row">
  <div class="col-md-8">.col-md-8</div>
  <div class="col-md-4">.col-md-4</div>
</div>
<div class="row">
  <div class="col-md-4">.col-md-4</div>
  <div class="col-md-4">.col-md-4</div>
  <div class="col-md-4">.col-md-4</div>
</div>
<div class="row">
  <div class="col-md-6">.col-md-6</div>
  <div class="col-md-6">.col-md-6</div>
</div>

Example: Fluid container

Turn any fixed-width grid layout into a full-width layout by changing your outermost .container to .container-fluid.

<div class="container-fluid">
  <div class="row">
    ...
  </div>
</div>

Example: Mobile and desktop

Don't want your columns to simply stack in smaller devices? Use the extra small and medium device grid classes by adding .col-xs-* .col-md-* to your columns. See the example below for a better idea of how it all works.

.col-xs-12 .col-md-8
.col-xs-6 .col-md-4
.col-xs-6 .col-md-4
.col-xs-6 .col-md-4
.col-xs-6 .col-md-4
.col-xs-6
.col-xs-6
Stack the columns on mobile by making one full-width and the other half-width
<div class="row">
  <div class="col-xs-12 col-md-8">.col-xs-12 .col-md-8</div>
  <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
</div>

Columns start at 50% wide on mobile and bump up to 33.3% wide on desktop
<div class="row">
  <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
  <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
  <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
</div>

Columns are always 50% wide, on mobile and desktop
<div class="row">
  <div class="col-xs-6">.col-xs-6</div>
  <div class="col-xs-6">.col-xs-6</div>
</div>

Example: Mobile, tablet, desktops

Build on the previous example by creating even more dynamic and powerful layouts with tablet .col-sm-* classes.

.col-xs-12 .col-sm-6 .col-md-8
.col-xs-6 .col-md-4
.col-xs-6 .col-sm-4
.col-xs-6 .col-sm-4
.col-xs-6 .col-sm-4
<div class="row">
  <div class="col-xs-12 col-sm-6 col-md-8">.col-xs-12 .col-sm-6 .col-md-8</div>
  <div class="col-xs-6 col-md-4">.col-xs-6 .col-md-4</div>
</div>
<div class="row">
  <div class="col-xs-6 col-sm-4">.col-xs-6 .col-sm-4</div>
  <div class="col-xs-6 col-sm-4">.col-xs-6 .col-sm-4</div>
  Optional: clear the XS cols if their content doesn't match in height
  <div class="clearfix visible-xs"></div>
  <div class="col-xs-6 col-sm-4">.col-xs-6 .col-sm-4</div>
</div>

Responsive column resets

With the four tiers of grids available you're bound to run into issues where, at certain breakpoints, your columns don't clear quite right as one is taller than the other. To fix that, use a combination of a .clearfix and our responsive utility classes.

.col-xs-6 .col-sm-3
Resize your viewport or check it out on your phone for an example.
.col-xs-6 .col-sm-3
.col-xs-6 .col-sm-3
.col-xs-6 .col-sm-3
<div class="row">
  <div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>
  <div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>

  Add the extra clearfix for only the required viewport
  <div class="clearfix visible-xs"></div>

  <div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>
  <div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>
</div>

In addition to column clearing at responsive breakpoints, you may need to reset offsets, pushes, or pulls. Those resets are available for medium and large grid tiers only, since they start only at the (second) small grid tier. See this in action in the grid example.

<div class="row">
  <div class="col-sm-5 col-md-6">.col-sm-5 .col-md-6</div>
  <div class="col-sm-5 col-sm-offset-2 col-md-6 col-md-offset-0">.col-sm-5 .col-sm-offset-2 .col-md-6 .col-md-offset-0</div>
</div>
<div class="row">
  <div class="col-sm-6 col-md-5 col-lg-6">.col-sm-6 .col-md-5 .col-lg-6</div>
  <div class="col-sm-6 col-md-5 col-md-offset-2 col-lg-6 col-lg-offset-0">.col-sm-6 .col-md-5 .col-md-offset-2 .col-lg-6 .col-lg-offset-0</div>
</div>

Offsetting columns

Move columns to the right using .col-md-offset-* classes. These classes increase the left margin of a column by * columns. For example, .col-md-offset-4 moves .col-md-4 over four columns.

.col-md-4
.col-md-4 .col-md-offset-4
.col-md-3 .col-md-offset-3
.col-md-3 .col-md-offset-3
.col-md-6 .col-md-offset-3
<div class="row">
  <div class="col-md-4">.col-md-4</div>
  <div class="col-md-4 col-md-offset-4">.col-md-4 .col-md-offset-4</div>
</div>
<div class="row">
  <div class="col-md-3 col-md-offset-3">.col-md-3 .col-md-offset-3</div>
  <div class="col-md-3 col-md-offset-3">.col-md-3 .col-md-offset-3</div>
</div>
<div class="row">
  <div class="col-md-6 col-md-offset-3">.col-md-6 .col-md-offset-3</div>
</div>

Nesting columns

To nest your content with the default grid, add a new .row and set of .col-md-* columns within an existing .col-md-* column. Nested rows should include a set of columns that add up to 12.

Level 1: .col-md-9
Level 2: .col-md-6
Level 2: .col-md-6 
<div class="row">
  <div class="col-md-9">
	Level 1: .col-md-9
	<div class="row">
	  <div class="col-md-6">
		Level 2: .col-md-6
	  </div>
	  <div class="col-md-6">
		Level 2: .col-md-6
	  </div>
	</div>
  </div>
</div>

Column ordering

Easily change the order of our built-in grid columns with .col-md-push-* and .col-md-pull-* modifier classes.

.col-md-9 .col-md-push-3
.col-md-3 .col-md-pull-9
<div class="row">
  <div class="col-md-9 col-md-push-3">.col-md-9 .col-md-push-3</div>
  <div class="col-md-3 col-md-pull-9">.col-md-3 .col-md-pull-9</div>
</div>

LESS mixins and variables

In addition to prebuilt grid classes for fast layouts, Bootstrap includes LESS variables and mixins for quickly generating your own simple, semantic layouts.

Variables

Variables determine the number of columns, the gutter width, and the media query point at which to begin floating columns. We use these to generate the predefined grid classes documented above, as well as for the custom mixins listed below.

@grid-columns:12;
@grid-gutter-width:         30px;
@grid-float-breakpoint:     768px;

Mixins

Mixins are used in conjunction with the grid variables to generate semantic CSS for individual grid columns.

// Creates a wrapper for a series of columns
.make-row(@gutter: @grid-gutter-width) {
  // Then clear the floated columns
  .clearfix();

  @media (min-width: @screen-sm-min) {
	margin-left:  (@gutter / -2);
	margin-right: (@gutter / -2);
  }

  // Negative margin nested rows out to align the content of columns
  .row {
	margin-left:  (@gutter / -2);
	margin-right: (@gutter / -2);
  }
}

// Generate the extra small columns
.make-xs-column(@columns; @gutter: @grid-gutter-width) {
  position: relative;
  // Prevent columns from collapsing when empty
  min-height: 1px;
  // Inner gutter via padding
  padding-left:  (@gutter / 2);
  padding-right: (@gutter / 2);

  // Calculate width based on number of columns available
  @media (min-width: @grid-float-breakpoint) {
	float: left;
	width: percentage((@columns / @grid-columns));
  }
}

// Generate the small columns
.make-sm-column(@columns; @gutter: @grid-gutter-width) {
  position: relative;
  // Prevent columns from collapsing when empty
  min-height: 1px;
  // Inner gutter via padding
  padding-left:  (@gutter / 2);
  padding-right: (@gutter / 2);

  // Calculate width based on number of columns available
  @media (min-width: @screen-sm-min) {
	float: left;
	width: percentage((@columns / @grid-columns));
  }
}

// Generate the small column offsets
.make-sm-column-offset(@columns) {
  @media (min-width: @screen-sm-min) {
	margin-left: percentage((@columns / @grid-columns));
  }
}
.make-sm-column-push(@columns) {
  @media (min-width: @screen-sm-min) {
	left: percentage((@columns / @grid-columns));
  }
}
.make-sm-column-pull(@columns) {
  @media (min-width: @screen-sm-min) {
	right: percentage((@columns / @grid-columns));
  }
}

// Generate the medium columns
.make-md-column(@columns; @gutter: @grid-gutter-width) {
  position: relative;
  // Prevent columns from collapsing when empty
  min-height: 1px;
  // Inner gutter via padding
  padding-left:  (@gutter / 2);
  padding-right: (@gutter / 2);

  // Calculate width based on number of columns available
  @media (min-width: @screen-md-min) {
	float: left;
	width: percentage((@columns / @grid-columns));
  }
}

// Generate the medium column offsets
.make-md-column-offset(@columns) {
  @media (min-width: @screen-md-min) {
	margin-left: percentage((@columns / @grid-columns));
  }
}
.make-md-column-push(@columns) {
  @media (min-width: @screen-md-min) {
	left: percentage((@columns / @grid-columns));
  }
}
.make-md-column-pull(@columns) {
  @media (min-width: @screen-md-min) {
	right: percentage((@columns / @grid-columns));
  }
}

// Generate the large columns
.make-lg-column(@columns; @gutter: @grid-gutter-width) {
  position: relative;
  // Prevent columns from collapsing when empty
  min-height: 1px;
  // Inner gutter via padding
  padding-left:  (@gutter / 2);
  padding-right: (@gutter / 2);

  // Calculate width based on number of columns available
  @media (min-width: @screen-lg-min) {
	float: left;
	width: percentage((@columns / @grid-columns));
  }
}

// Generate the large column offsets
.make-lg-column-offset(@columns) {
  @media (min-width: @screen-lg-min) {
	margin-left: percentage((@columns / @grid-columns));
  }
}
.make-lg-column-push(@columns) {
  @media (min-width: @screen-lg-min) {
	left: percentage((@columns / @grid-columns));
  }
}
.make-lg-column-pull(@columns) {
  @media (min-width: @screen-lg-min) {
	right: percentage((@columns / @grid-columns));
  }
}

Example usage

You can modify the variables to your own custom values, or just use the mixins with their default values. Here's an example of using the default settings to create a two-column layout with a gap between.

.wrapper {
  .make-row();
}
.content-main {
  .make-lg-column(8);
}
.content-secondary {
  .make-lg-column(3);
  .make-lg-column-offset(1);
}

<div class="wrapper">
  <div class="content-main">...</div>
  <div class="content-secondary">...</div>
</div>

Typography

Headings

All HTML headings, <h1> through <h6>, are available. .h1 through .h6 classes are also available, for when you want to match the font styling of a heading but still want your text to be displayed inline.

h1. Bootstrap heading

 Semibold 36px

h2. Bootstrap heading

 Semibold 30px

h3. Bootstrap heading

 Semibold 24px

h4. Bootstrap heading

 Semibold 18px
h5. Bootstrap heading
 Semibold 14px
h6. Bootstrap heading
 Semibold 12px 
<h1>h1. Bootstrap heading</h1>
<h2>h2. Bootstrap heading</h2>
<h3>h3. Bootstrap heading</h3>
<h4>h4. Bootstrap heading</h4>
<h5>h5. Bootstrap heading</h5>
<h6>h6. Bootstrap heading</h6>

Create lighter, secondary text in any heading with a generic <small> tag or the .small class.

h1. Bootstrap heading Secondary text

h2. Bootstrap heading Secondary text

h3. Bootstrap heading Secondary text

h4. Bootstrap heading Secondary text
h5. Bootstrap heading Secondary text
h6. Bootstrap heading Secondary text
 
<h1>h1. Bootstrap heading <small>Secondary text</small></h1>
<h2>h2. Bootstrap heading <small>Secondary text</small></h2>
<h3>h3. Bootstrap heading <small>Secondary text</small></h3>
<h4>h4. Bootstrap heading <small>Secondary text</small></h4>
<h5>h5. Bootstrap heading <small>Secondary text</small></h5>
<h6>h6. Bootstrap heading <small>Secondary text</small></h6>

Body copy

Bootstrap's global default font-size is 11px, with a line-height of 11px. This is applied to the <body>. In addition, <p> (paragraphs) receive a line-height of 20px and bottom margin of 10px.

Nullam quis risus eget urna mollis ornare vel eu leo. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Nullam id dolor id nibh ultricies vehicula.

Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec ullamcorper nulla non metus auctor fringilla. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Donec ullamcorper nulla non metus auctor fringilla.

Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.

<p>...</p>

Lead body copy

Make a paragraph stand out by adding .lead.

Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Duis mollis, est non commodo luctus.

<p class="lead">...</p>

Built with Less

The typographic scale is based on two LESS variables in variables.less: @font-size-base and @line-height-base. The first is the base font-size used throughout and the second is the base line-height. We use those variables and some simple math to create the margins, paddings, and line-heights of all our type and more. Customize them and Bootstrap adapts.

Emphasis

Make use of HTML's default emphasis tags with lightweight styles.

Small text

For de-emphasizing inline or blocks of text, use the <small> tag to set text at 85% the size of the parent. Heading elements receive their own font-size for nested <small> elements.

You may alternatively use an inline element with .small in place of any <small>

This line of text is meant to be treated as fine print.

<small>This line of text is meant to be treated as fine print.</small>

Bold

For emphasizing a snippet of text with a heavier font-weight.

The following snippet of text is rendered as bold text.

<strong>rendered as bold text</strong>

Italics

For emphasizing a snippet of text with italics.

The following snippet of text is rendered as italicized text.

<em>rendered as italicized text</em>

Alternate elements

Feel free to use <b> and <i> in HTML5. <b> is meant to highlight words or phrases without conveying additional importance while <i> is mostly for voice, technical terms, etc.

Alignment classes

Easily realign text to components with text alignment classes.

Left aligned text.

Center aligned text.

Right aligned text.

<p class="text-left">Left aligned text.</p>
<p class="text-center">Center aligned text.</p>
<p class="text-right">Right aligned text.</p>

Emphasis classes

Convey meaning through color with a handful of emphasis utility classes. These may also be applied to links and will darken on hover just like our default link styles.

Fusce dapibus, tellus ac cursus commodo, tortor mauris nibh.

Nullam id dolor id nibh ultricies vehicula ut id elit.

Duis mollis, est non commodo luctus, nisi erat porttitor ligula.

Maecenas sed diam eget risus varius blandit sit amet non magna.

Etiam porta sem malesuada magna mollis euismod.

Donec ullamcorper nulla non metus auctor fringilla.

<p class="text-muted">...</p>
<p class="text-primary">...</p>
<p class="text-success">...</p>
<p class="text-info">...</p>
<p class="text-warning">...</p>
<p class="text-danger">...</p>

Dealing with specificity

Sometimes emphasis classes cannot be applied due to the specificity of another selector. In most cases, a sufficient workaround is to wrap your text in a <span> with the class.

Abbreviations

Stylized implementation of HTML's <abbr> element for abbreviations and acronyms to show the expanded version on hover. Abbreviations with a title attribute have a light dotted bottom border and a help cursor on hover, providing additional context on hover.

Basic abbreviation

For expanded text on long hover of an abbreviation, include the title attribute with the <abbr> element.

An abbreviation of the word attribute is attr.

<abbr title="attribute">attr</abbr>

Initialism

Add .initialism to an abbreviation for a slightly smaller font-size.

HTML is the best thing since sliced bread.

<abbr title="HyperText Markup Language" class="initialism">HTML</abbr>

Addresses

Present contact information for the nearest ancestor or the entire body of work. Preserve formatting by ending all lines with <br>.

Twitter, Inc.
795 Folsom Ave, Suite 600
San Francisco, CA 94107
P: (123) 456-7890
Full Name
first.last@example.com 
<address>
  <strong>Twitter, Inc.</strong><br>
  795 Folsom Ave, Suite 600<br>
  San Francisco, CA 94107<br>
  <abbr title="Phone">P:</abbr> (123) 456-7890
</address>
<address>
  <strong>Full Name</strong><br>
  <a href="mailto:#">first.last@example.com</a>
</address>

Blockquotes

For quoting blocks of content from another source within your document.

Default blockquote

Wrap <blockquote> around any HTML as the quote. For straight quotes, we recommend a <p>.

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.

<blockquote> <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p> </blockquote>

Blockquote options

Style and content changes for simple variations on a standard <blockquote>.

Naming a source

Add <small> tag or .small class for identifying the source. Wrap the name of the source work in <cite>.

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.

Someone famous in Source Title 
<blockquote><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p><small>Someone famous in <cite title="Source Title">Source Title</cite></small></blockquote>

Alternate displays

Use .pull-right for a floated, right-aligned blockquote.

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.

Someone famous in Source Title 
<blockquote class="pull-right">
...
</blockquote>

Lists

Unordered

A list of items in which the order does not explicitly matter.

  • Lorem ipsum dolor sit amet
  • Consectetur adipiscing elit
  • Integer molestie lorem at massa
  • Facilisis in pretium nisl aliquet
  • Nulla volutpat aliquam velit
    • Phasellus iaculis neque
    • Purus sodales ultricies
    • Vestibulum laoreet porttitor sem
    • Ac tristique libero volutpat at
  • Faucibus porta lacus fringilla vel
  • Aenean sit amet erat nunc
  • Eget porttitor lorem
<ul>
<li>...</li>
</ul>

Ordered

A list of items in which the order does explicitly matter.

  1. Lorem ipsum dolor sit amet
  2. Consectetur adipiscing elit
  3. Integer molestie lorem at massa
  4. Facilisis in pretium nisl aliquet
  5. Nulla volutpat aliquam velit
  6. Faucibus porta lacus fringilla vel
  7. Aenean sit amet erat nunc
  8. Eget porttitor lorem
<ol>
<li>...</li>
</ol>

Unstyled

Remove the default list-style and left margin on list items (immediate children only). This only applies to immediate children list items, meaning you will need to add the class for any nested lists as well.

  • Lorem ipsum dolor sit amet
  • Consectetur adipiscing elit
  • Integer molestie lorem at massa
  • Facilisis in pretium nisl aliquet
  • Nulla volutpat aliquam velit
    • Phasellus iaculis neque
    • Purus sodales ultricies
    • Vestibulum laoreet porttitor sem
    • Ac tristique libero volutpat at
  • Faucibus porta lacus fringilla vel
  • Aenean sit amet erat nunc
  • Eget porttitor lorem
<ul class="list-unstyled">
  <li>...</li>
</ul>

Inline

Place all list items on a single line with display: inline-block; and some light padding.

  • Lorem ipsum
  • Phasellus iaculis
  • Nulla volutpat
<ul class="list-inline">
  <li>...</li>
</ul>

Description

A list of terms with their associated descriptions.

Description lists
A description list is perfect for defining terms.
Euismod
Vestibulum id ligula porta felis euismod semper eget lacinia odio sem nec elit.
Donec id elit non mi porta gravida at eget metus.
Malesuada porta
Etiam porta sem malesuada magna mollis euismod.
<dl>
  <dt>...</dt>
  <dd>...</dd>
</dl>

Horizontal description

Make terms and descriptions in <dl> line up side-by-side. Starts off stacked like default <dl>s, but when the navbar expands, so do these.

Description lists
A description list is perfect for defining terms.
Euismod
Vestibulum id ligula porta felis euismod semper eget lacinia odio sem nec elit.
Donec id elit non mi porta gravida at eget metus.
Malesuada porta
Etiam porta sem malesuada magna mollis euismod.
Felis euismod semper eget lacinia
Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.
<dl class="dl-horizontal">
  <dt>...</dt>
  <dd>...</dd>
</dl>

Auto-truncating

Horizontal description lists will truncate terms that are too long to fit in the left column with text-overflow. In narrower viewports, they will change to the default stacked layout.

Code

Inline

Wrap inline snippets of code with <code>.

For example, <section> should be wrapped as inline.
For example, <code><section></code> should be wrapped as inline.

User input

Use the <kbd> to indicate input that is typically entered via keyboard.

To switch directories, type cd followed by the name of the directory.
  To switch directories, type <kbd>cd</kbd> followed by the name of the directory.

Basic block

Use <pre> for multiple lines of code. Be sure to escape any angle brackets in the code for proper rendering.

Sample text here...
<pre>Sample text here...</pre>

You may optionally add the .pre-scrollable class, which will set a max-height of 350px and provide a y-axis scrollbar.

Tables

Basic example

For basic styling—light padding and only horizontal dividers—add the base class .table to any <table>. It may seem super redundant, but given the widespread use of tables for other plugins like calendars and date pickers, we've opted to isolate our custom table styles.

# First Name Last Name Username
1 Mark Otto @mdo
2 Jacob Thornton @fat
3 Larry the Bird @twitter 
<table class="table">
  ...
</table>

Striped rows

Use .table-striped to add zebra-striping to any table row within the <tbody>.

Cross-browser compatibility

Striped tables are styled via the :nth-child CSS selector, which is not available in Internet Explorer 8.

# First Name Last Name Username
1 Mark Otto @mdo
2 Jacob Thornton @fat
3 Larry the Bird @twitter 
<table class="table table-striped">
  ...
</table>

Bordered table

Add .table-bordered for borders on all sides of the table and cells.

# First Name Last Name Username
1 Mark Otto @mdo
Mark Otto @TwBootstrap
2 Jacob Thornton @fat
3 Larry the Bird @twitter 
<table class="table table-bordered">
  ...
</table>

Hover rows

Add .table-hover to enable a hover state on table rows within a <tbody>.

# First Name Last Name Username
1 Mark Otto @mdo
2 Jacob Thornton @fat
3 Larry the Bird @twitter 
<table class="table table-hover">
  ...
</table>

Condensed table

Add .table-condensed to make tables more compact by cutting cell padding in half.

# First Name Last Name Username
1 Mark Otto @mdo
2 Jacob Thornton @fat
3 Larry the Bird @twitter 
<table class="table table-condensed">
  ...
</table>

Contextual classes

Use contextual classes to color table rows or individual cells.

Class Description
.active Applies the hover color to a particular row or cell
.success Indicates a successful or positive action
.warning Indicates a warning that might need attention
.danger Indicates a dangerous or potentially negative action
# Column heading Column heading Column heading
1 Column content Column content Column content
2 Column content Column content Column content
3 Column content Column content Column content
4 Column content Column content Column content
5 Column content Column content Column content
6 Column content Column content Column content
7 Column content Column content Column content 
On rows
<tr class="active">...</tr>
<tr class="success">...</tr>
<tr class="warning">...</tr>
<tr class="danger">...</tr>

On cells (`td` or `th`)
<tr>
  <td class="active">...</td>
  <td class="success">...</td>
  <td class="warning">...</td>
  <td class="danger">...</td>
</tr>

Responsive tables

Create responsive tables by wrapping any .table in .table-responsive to make them scroll horizontally up to small devices (under 768px). When viewing on anything larger than 768px wide, you will not see any difference in these tables.

# Table heading Table heading Table heading Table heading Table heading Table heading
1 Table cell Table cell Table cell Table cell Table cell Table cell
2 Table cell Table cell Table cell Table cell Table cell Table cell
3 Table cell Table cell Table cell Table cell Table cell Table cell
# Table heading Table heading Table heading Table heading Table heading Table heading
1 Table cell Table cell Table cell Table cell Table cell Table cell
2 Table cell Table cell Table cell Table cell Table cell Table cell
3 Table cell Table cell Table cell Table cell Table cell Table cell 
<div class="table-responsive">
  <table class="table">
	...
  </table>
</div>

Forms

Basic example

Individual form controls automatically receive some global styling. All textual <input>, <textarea>, and <select> elements with .form-control are set to width: 100%; by default. Wrap labels and controls in .form-group for optimum spacing.

Example block-level help text here.

<form role="form">
  <div class="form-group">
	<label class="col-xs-2" for="exampleInputEmail1">Email address</label>
	<input type="email" class="col-xs-3" id="exampleInputEmail1" placeholder="Enter email">
  </div>
  <div class="form-group">
	<label class="col-xs-2" for="exampleInputPassword1">Password</label>
	<input type="password" class="col-xs-3" id="exampleInputPassword1" placeholder="Password">
  </div>
  <div class="form-group">
	<label class="col-xs-2" for="exampleInputFile">File input</label>
	<input type="file" class="col-xs-3" id="exampleInputFile">
	<p class="help-block">Example block-level help text here.</p>
  </div>
  <div class="checkbox">
	<label>
	  <input type="checkbox"> Check me out
	</label>
  </div>
  <button type="submit" class="btn btn-default">Submit</button>
</form>

Inline form

Add .form-inline to your <form> for left-aligned and inline-block controls. This only applies to forms within viewports that are at least 768px wide.

Requires custom widths

Inputs, selects, and textareas are 100% wide by default in Bootstrap. To use the inline form, you'll have to set a width on the form controls used within.

Always add labels

Screen readers will have trouble with your forms if you don't include a label for every input. For these inline forms, you can hide the labels using the .sr-only class.

<form class="form-inline" role="form">
  <div class="form-group">
	<label class="sr-only" for="exampleInputEmail2">Email address</label>
	<input type="email" class="form-control" id="exampleInputEmail2" placeholder="Enter email">
  </div>
  <div class="form-group">
	<label class="sr-only" for="exampleInputPassword2">Password</label>
	<input type="password" class="form-control" id="exampleInputPassword2" placeholder="Password">
  </div>
  <div class="checkbox">
	<label>
	  <input type="checkbox"> Remember me
	</label>
  </div>
  <button type="submit" class="btn btn-default">Sign in</button>
</form>

Supported controls

Examples of standard form controls supported in an example form layout.

Inputs

Most common form control, text-based input fields. Includes support for all HTML5 types: text, password, datetime, datetime-local, date, month, time, week, number, email, url, search, tel, and color.

Type declaration required

Inputs will only be fully styled if their type is properly declared.

<input type="text" class="col-sm-3" placeholder="Text input">

Input groups

To add integrated text or buttons before and/or after any text-based <input>, check out the input group component.

Textarea

Form control which supports multiple lines of text. Change rows attribute as necessary.

<textarea class="col-sm-3" rows="3"></textarea>

Checkboxes and radios

Checkboxes are for selecting one or several options in a list while radios are for selecting one option from many.

Default (stacked)


<div class="checkbox">
  <label>
	<input type="checkbox" value="">
	Option one is this and that&mdash;be sure to include why it's great
  </label>
</div>

<div class="radio">
  <label>
	<input type="radio" name="optionsRadios" id="optionsRadios1" value="option1" checked>
	Option one is this and that&mdash;be sure to include why it's great
  </label>
</div>
<div class="radio">
  <label>
	<input type="radio" name="optionsRadios" id="optionsRadios2" value="option2">
	Option two can be something else and selecting it will deselect option one
  </label>
</div>

Inline checkboxes

Use .checkbox-inline or .radio-inline class to a series of checkboxes or radios for controls appear on the same line.

Not recommended

We don't recommend to use inline checkboxes, here is an example of how they should be displayed: stacked checkboxes

<label class="checkbox-inline">
  <input type="checkbox" id="inlineCheckbox1" value="option1"> 1
</label>
<label class="checkbox-inline">
  <input type="checkbox" id="inlineCheckbox2" value="option2"> 2
</label>
<label class="checkbox-inline">
  <input type="checkbox" id="inlineCheckbox3" value="option3"> 3
</label>

Selects

Use the default option, or add multiple to show multiple options at once.



<select class="form-control col-sm-3">
  <option>1</option>
  <option>2</option>
  <option>3</option>
  <option>4</option>
  <option>5</option>
</select>

<select multiple class="form-control col-sm-3">
  <option>1</option>
  <option>2</option>
  <option>3</option>
  <option>4</option>
  <option>5</option>
</select>

Static control

When you need to place plain text next to a form label within a horizontal form, use the .form-control-static class on a <p>.

email@example.com

<form class="form-horizontal" role="form">
  <div class="form-group">
	<label class="col-sm-2 control-label">Email</label>
	<div class="col-sm-3">
	  <p class="form-control-static">email@example.com</p>
	</div>
  </div>
  <div class="form-group">
	<label for="inputPassword" class="col-sm-2 control-label">Password</label>
	<div class="col-sm-3">
	  <input type="password" class="form-control" id="inputPassword" placeholder="Password">
	</div>
  </div>
</form>

Input focus

We remove the default outline styles on some form controls and apply a box-shadow in its place for :focus.

Demo :focus state

The above example input uses custom styles in our documentation to demonstrate the :focus state on a .form-control.

<input class="form-control col-sm-3" id="focusedInput" type="text" value="This is focused...">

Disabled inputs

Add the disabled attribute on an input to prevent user input and trigger a slightly different look.

<input class="form-control col-sm-3" id="disabledInput" type="text" placeholder="Disabled input here..." disabled>

Disabled fieldsets

Add the disabled attribute to a <fieldset> to disable all the controls within the <fieldset> at once.

Link functionality of <a> not impacted

This class will only change the appearance of <a class="btn btn-default"> buttons, not their functionality. Use custom JavaScript to disable links here.

Cross-browser compatibility

While Bootstrap will apply these styles in all browsers, Internet Explorer 9 and below don't actually support the disabled attribute on a <fieldset>. Use custom JavaScript to disable the fieldset in these browsers.

<form role="form">
  <fieldset disabled>
	<div class="form-group">
	  <label class="col-sm-2" for="disabledTextInput">Disabled input</label>
	  <input type="text" id="disabledTextInput" class="form-control col-sm-3" placeholder="Disabled input">
	</div>
	<div class="form-group">
	  <label class="col-sm-2" for="disabledSelect">Disabled select menu</label>
	  <select id="disabledSelect" class="form-control col-sm-3">
		<option>Disabled select</option>
	  </select>
	</div>
	<div class="checkbox">
	  <label>
		<input type="checkbox"> Can't check this
	  </label>
	</div>
	<button type="submit" class="btn btn-primary">Submit</button>
  </fieldset>
</form>

Validation states

Bootstrap includes validation styles for error, warning, and success states on form controls. To use, add .has-warning or .has-error to the parent element. Any .control-label, .form-control, and .help-block within that element will receive the validation styles.


<div class="form-group has-warning">
  <label class="control-label" for="inputWarning1">Input with warning</label>
  <input type="text" class="form-control" id="inputWarning1">
</div>
<div class="form-group has-error">
  <label class="control-label" for="inputError1">Input with error</label>
  <input type="text" class="form-control" id="inputError1">
</div>

Required fields

Required fields use .required class.

<div class="form-group required">
  <label class="control-label col-sm-2" for="required">Required input</label>
  <input type="text" class="form-control col-sm-3" id="required">
</div>

Control sizing

Set heights using classes like .input-lg, and set widths using grid column classes like .col-lg-*.

Height sizing

Create larger or smaller form controls that match button sizes.










<input class="form-control input-lg col-sm-3" type="text" placeholder=".input-lg">
<input class="form-control col-sm-3" type="text" placeholder="Default input">

<select class="form-control input-lg col-sm-3">...</select>
<select class="form-control col-sm-3">...</select>

Column sizing

Wrap inputs in grid columns, or any custom parent element, to easily enforce desired widths.

<div class="row">
  <div class="col-xs-2">
	<input type="text" class="form-control" placeholder=".col-xs-2">
  </div>
  <div class="col-xs-3">
	<input type="text" class="form-control" placeholder=".col-xs-3">
  </div>
  <div class="col-xs-4">
	<input type="text" class="form-control" placeholder=".col-xs-4">
  </div>
</div>

Group boxes

Form groups using <fieldset> tag. Using the grid classes col-md-* in order to arrange the boxes.

Group box in two columns

Form group heading
Form group heading 
<form role="form">
  <fieldset class="col-md-6" >
	<div class="form-group">
	  <label class="col-sm-5" for="Loremipsum">Lorem ipsum</label>
	  <input type="text" id="Loremipsum" class="form-control col-sm-7" placeholder="Loremipsum">
	</div>
	<div class="form-group">
	  <label class="col-sm-5" for="Quisque">Quisque</label>
	  <select id="Quisque" class="form-control col-sm-7">
		<option>Quisque 1</option>
                <option>Quisque 2</option>
	  </select>
	</div>
	<div class="form-group disabled">
	  <label class="col-sm-5" for="Disabled">Disabled</label>
	  <input type="text" id="Disabled" class="form-control col-sm-7" placeholder="Disabled">
	</div>
  </fieldset>
  <fieldset class="col-md-6" >
	<div class="form-group">
	  <label class="col-sm-5" for="Curabituraliquet">Curabitur aliquet</label>
	  <input type="text" id="Curabituraliquet" class="form-control col-sm-7" placeholder="Curabitur aliquet">
	</div>
	<div class="form-group">
	  <label class="col-sm-5" for="Pellentesque">Pellentesque</label>
	  <input type="text" id="Pellentesque" class="form-control col-sm-7" placeholder="Pellentesque">
	</div>
	<div class="form-group">
	  <label class="col-sm-5" for="Sedtempus">Sed tempus</label>
	  <input type="text" id="Sedtempus" class="form-control col-sm-7" placeholder="Sed tempus">
	</div>
  </fieldset>
</form>

Group box in only one column

Form group heading 
<form role="form">
  <fieldset class="col-md-12" >
	<div class="form-group">
	  <label class="col-sm-5" for="Loremipsum2">Lorem ipsum</label>
	  <input type="text" id="Loremipsum2" class="form-control col-sm-7" placeholder="Loremipsum">
	</div>
	<div class="form-group">
	  <label class="col-sm-5" for="Quisque2">Quisque</label>
	  <input type="text" id="Quisque2" class="form-control col-sm-7" placeholder="Quisque">
	</div>
	<div class="form-group">
	  <label class="col-sm-5" for="Vivamuseu2">Vivamus eu</label>
	  <input type="text" id="Vivamuseu2" class="form-control col-sm-7" placeholder="Vivamus eu">
	</div>
  </fieldset>
</form>

Help text

Block level help text for form controls.

A block of help text that breaks onto a new line and may extend beyond one line. 
<span class="help-block">A block of help text that breaks onto a new line and may extend beyond one line.</span>

Buttons

Options

Use any of the available button classes to quickly create a styled button.

Standard button
<button type="button" class="btn btn-default">Default</button>

Primary button
<button type="button" class="btn btn-primary">Primary</button>

Deemphasize a button by making it look like a link while maintaining button behavior
<button type="button" class="btn btn-link">Link</button>

Directional buttons

Add and additional <span> inside the <div class="btn btn-primary"> also add .left or .right class together with .btn class for the direction needed.

<button class="btn left" href="##"><span>Back</span></button>
<button class="btn right" href="##"><span>Forward</span></button>

<button class="btn left btn-primary" href="##"><span>Back primary</span></button>
<button class="btn right btn-primary" href="##"><span>Forward primary</span></button>

Sizes

Fancy larger or regular buttons? Add .btn-lg for large sizes, and keep just .btn for the regular size.







<button type="button" class="btn btn-primary btn-lg">Large button</button>
<button type="button" class="btn btn-default btn-lg">Large button</button>

<button type="button" class="btn btn-primary">Default button</button>
<button type="button" class="btn btn-default">Default button</button>

<button class="btn btn-lg left"><span>Large button</span></button>
<button class="btn btn-lg right"><span>Large button</span></button>

<button class="btn left"><span>Default button</span></button>
<button class="btn right"><span>Default button</span></button>

<button class="btn btn-lg left btn-primary"><span>Large button</span></button>
<button class="btn btn-lg right btn-primary"><span>Large button</span></button>

<button class="btn left btn-primary"><span>Default button</span></button>
<button class="btn right btn-primary"><span>Default button</span></button>

Create block level buttons—those that span the full width of a parent— by adding .btn-block.

<button type="button" class="btn btn-primary btn-lg btn-block">Block level button</button>
<button type="button" class="btn btn-default btn-lg btn-block">Block level button</button>

Active state

Buttons will appear pressed (with a darker background, darker border, and inset shadow) when active. For <button> elements, this is done via :active. For <a> elements, it's done with .active. However, you may use .active <button>s should you need to replicate the active state progammatically.

Button element

No need to add :active as it's a pseudo-class, but if you need to force the same appearance, go ahead and add .active.

<button type="button" class="btn btn-primary active">Primary button</button>
<button type="button" class="btn btn-default active">Button</button>

Anchor element

Add the .active class to <a> buttons.

Primary link Link 

<a href="#" class="btn btn-primary active" role="button">Primary link</a>
<a href="#" class="btn btn-default active" role="button">Link</a>

Disabled state

Make buttons look unclickable by fading them back 50%.

Button element

Add the disabled attribute to <button> buttons.

<button type="button" class="btn btn-lg btn-primary" disabled="disabled">Primary button</button>
<button type="button" class="btn btn-default btn-lg" disabled="disabled">Button</button>

Cross-browser compatibility

If you add the disabled attribute to a <button>, Internet Explorer 9 and below will render text gray with a nasty text-shadow that we cannot fix.

Anchor element

Add the .disabled class to <a> buttons.

Primary link Link 

<a href="#" class="btn btn-primary btn-lg disabled" role="button">Primary link</a>
<a href="#" class="btn btn-default btn-lg disabled" role="button">Link</a>

We use .disabled as a utility class here, similar to the common .active class, so no prefix is required.

Link functionality not impacted

This class will only change the <a>'s appearance, not its functionality. Use custom JavaScript to disable links here.

Context-specific usage

While button classes can be used on <a> and <button> elements, only <button> elements are supported within our nav and navbar components.

Button tags

Use the button classes on an <a>, <button>, or <input> element.

Link
Primary Link 
<a class="btn btn-default" href="#" role="button">Link</a>
<button class="btn btn-default" type="submit">Button</button>
<input class="btn btn-default" type="button" value="Input">
<input class="btn btn-default" type="submit" value="Submit">

<a class="btn btn-primary" href="#" role="button">Primary Link</a>
<button class="btn btn-primary" type="submit">Primary Button</button>
<input class="btn btn-primary" type="button" value="Primary Input">
<input class="btn btn-primary" type="submit" value="Primary Submit">

Cross-browser rendering

As a best practice, we highly recommend using the <button> element whenever possible to ensure matching cross-browser rendering.

Among other things, there's a Firefox bug that prevents us from setting the line-height of <input>-based buttons, causing them to not exactly match the height of other buttons on Firefox.

Images

Responsive images

Images in Bootstrap 3 can be made responsive-friendly via the addition of the .img-responsive class. This applies max-width: 100%; and height: auto; to the image so that it scales nicely to the parent element.

<img src="..." class="img-responsive" alt="Responsive image">

Image shapes

Add classes to an <img> element to easily style images in any project.

Cross-browser compatibility

Keep in mind that Internet Explorer 8 lacks support for rounded corners.

140x140 140x140 140x140 
<img src="..." alt="..." class="img-rounded">
<img src="..." alt="..." class="img-circle">
<img src="..." alt="..." class="img-thumbnail">

Helper classes

Contextual colors

Convey meaning through color with a handful of emphasis utility classes. These may also be applied to links and will darken on hover just like our default link styles.

Fusce dapibus, tellus ac cursus commodo, tortor mauris nibh.

Nullam id dolor id nibh ultricies vehicula ut id elit.

Duis mollis, est non commodo luctus, nisi erat porttitor ligula.

Maecenas sed diam eget risus varius blandit sit amet non magna.

Etiam porta sem malesuada magna mollis euismod.

Donec ullamcorper nulla non metus auctor fringilla.

<p class="text-muted">...</p>
<p class="text-primary">...</p>
<p class="text-success">...</p>
<p class="text-info">...</p>
<p class="text-warning">...</p>
<p class="text-danger">...</p>

Dealing with specificity

Sometimes emphasis classes cannot be applied due to the specificity of another selector. In most cases, a sufficient workaround is to wrap your text in a <span> with the class.

Contextual backgrounds

Similar to the contextual text color classes, easily set the background of an element to any contextual class. Anchor components will darken on hover, just like the text classes.

Nullam id dolor id nibh ultricies vehicula ut id elit.

Duis mollis, est non commodo luctus, nisi erat porttitor ligula.

Maecenas sed diam eget risus varius blandit sit amet non magna.

Etiam porta sem malesuada magna mollis euismod.

Donec ullamcorper nulla non metus auctor fringilla.

<p class="bg-primary">...</p>
<p class="bg-success">...</p>
<p class="bg-info">...</p>
<p class="bg-warning">...</p>
<p class="bg-danger">...</p>

Close icon

Use the generic close icon for dismissing content like modals and alerts.

<button type="button" class="close" aria-hidden="true">&times;</button>

Carets

Use carets to indicate dropdown functionality and direction. Note that the default caret will reverse automatically in dropup menus.

<span class="caret"></span>

Quick floats

Float an element to the left or right with a class. !important is included to avoid specificity issues. Classes can also be used as mixins.

<div class="pull-left">...</div>
<div class="pull-right">...</div>

// Classes
.pull-left {
  float: left !important;
}
.pull-right {
  float: right !important;
}

// Usage as mixins
.element {
  .pull-left();
}
.another-element {
  .pull-right();
}

Not for use in navbars

To align components in navbars with utility classes, use .navbar-left or .navbar-right instead. See the navbar docs for details.

Center content blocks

Set an element to display: block and center via margin. Available as a mixin and class.

<div class="center-block">...</div>

// Classes
.center-block {
  display: block;
  margin-left: auto;
  margin-right: auto;
}
// Usage as mixins
.element {
  .center-block();
}

Clearfix

Clear the float on any element with the .clearfix class. Utilizes the micro clearfix as popularized by Nicolas Gallagher. Can also be used as a mixin.

Usage as a class
<div class="clearfix">...</div>

// Mixin itself
.clearfix() {
  &:before,
  &:after {
	content: " ";
	display: table;
  }
  &:after {
	clear: both;
  }
}

// Usage as a Mixin
.element {
  .clearfix();
}

Showing and hiding content

Force an element to be shown or hidden (including for screen readers) with the use of .show and .hidden classes. These classes use !important to avoid specificity conflicts, just like the quick floats. They are only available for block level toggling. They can also be used as mixins.

.hide is available, but it does not always affect screen readers and is deprecated as of v3.0.1. Use .hidden or .sr-only instead.

Furthermore, .invisible can be used to toggle only the visibility of an element, meaning its display is not modified and the element can still affect the flow of the document.

<div class="show">...</div>
<div class="hidden">...</div>

// Classes
.show {
  display: block !important;
}
.hidden {
  display: none !important;
  visibility: hidden !important;
}
.invisible {
  visibility: hidden;
}

// Usage as mixins
.element {
  .show();
}
.another-element {
  .hidden();
}

Screen reader content

Hide an element to all devices except screen readers with .sr-only. Necessary for following accessibility best practices. Can also be used as a mixin.

<a class="sr-only" href="#content">Skip to main content</a>

// Usage as a Mixin
.skip-navigation {
  .sr-only();
}

Image replacement

Utilize the .text-hide class or mixin to help replace an element's text content with a background image.

<h1 class="text-hide">Custom heading</h1>

// Usage as a Mixin
.heading {
  .text-hide();
}

Responsive utilities

For faster mobile-friendly development, use these utility classes for showing and hiding content by device via media query. Also included are utility classes for toggling content when printed.

Try to use these on a limited basis and avoid creating entirely different versions of the same site. Instead, use them to complement each device's presentation. Responsive utilities are currently only available for block and table toggling. Use with inline and table elements is currently not supported.

Available classes

Use a single or combination of the available classes for toggling content across viewport breakpoints.

Extra small devices Phones (<768px) Small devices Tablets (≥768px) Medium devices Desktops (≥992px) Large devices Desktops (≥1200px)
.visible-xs Visible
.visible-sm Visible
.visible-md Visible
.visible-lg Visible
.hidden-xs Visible Visible Visible
.hidden-sm Visible Visible Visible
.hidden-md Visible Visible Visible
.hidden-lg Visible Visible Visible

Print classes

Similar to the regular responsive classes, use these for toggling content for print.

Class Browser Print
.visible-print Visible
.hidden-print Visible

Test cases

Resize your browser or load on different devices to test the responsive utility classes.

Visible on...

Green checkmarks indicate the element is visible in your current viewport.


✔ Visible on x-small
✔ Visible on small
Medium ✔ Visible on medium
✔ Visible on large
✔ Visible on x-small and small
✔ Visible on medium and large
✔ Visible on x-small and medium
✔ Visible on small and large
✔ Visible on x-small and large
✔ Visible on small and medium

Hidden on...

Here, green checkmarks also indicate the element is hidden in your current viewport.


✔ Hidden on x-small
✔ Hidden on small
Medium ✔ Hidden on medium
✔ Hidden on large
✔ Hidden on x-small and small
✔ Hidden on medium and large
✔ Hidden on x-small and medium
✔ Hidden on small and large
✔ Hidden on x-small and large
✔ Hidden on small and medium

Using Less

Bootstrap's CSS is built on Less, a preprocessor with additional functionality like variables, mixins, and functions for compiling CSS. Those looking to use the source Less files instead of our compiled CSS files can make use of the numerous variables and mixins we use throughout the framework.

Grid variables and mixins are covered within the Grid system section.

Compiling Bootstrap

Bootstrap can be used in at least two ways: with the compiled CSS or with the source Less files. To compile the Less files, visit the README for how to setup your development environment to run the necessary commands.

Third party compilation tools may work with Bootstrap, but they are not supported by our core team.

Variables

Variables are used throughout the entire project as a way to centralize and share commonly used values like colors, spacing, or font stacks.

@base-color: Lorem ipsum dolor sit amet, consectetur adipiscing elit.

@link-color: Nulla a gravida felis. Nullam interdum aliquet velit.

@required-color: Nulla eu aliquam sapien. Aliquam vestibulum, arcu et gravida rutrum.

@disabled-color: Sed libero nisl, mollis imperdiet commodo a, volutpat in magna. 

@base-color: #202020;
@link-color: #4f82c7;
@required-color: #d20000;
@disabled-color: #828282;

Use any of these color variables as they are or reassign them to more meaningful variables for your project.

// Use as-is
p {
  color: @base-color;
}

Scaffolding

A handful of variables for quickly customizing key elements of your site's skeleton.

// Scaffolding
@contentBgColor: #f2f2f2;
@inputColor: @base-color;

Easily style your links with the right color with only one value.

// Variables
@link-color: #4f82c7;

// Usage
a {
  color: @link-color;
  text-decoration: none;

  &:hover {
    text-decoration: underline;
  }
}

Typography

Easily set your type face, text size, leading, and more with a few quick variables. Bootstrap makes use of these as well to provide easy typographic mixins.

@font-family-base: Verdana, Arial, Helvetica, sans-serif;
@font-size-base: 11px;
@line-height-base: 11px;

Icons

Two quick variables for customizing the location and filename of your icons.

@icon-font-path: "../fonts/";
@icon-font-name: "glyphicons-halflings-regular";

Components

Components throughout Bootstrap make use of some default variables for setting common values. Here are the most commonly used.

@border-radius-base: 4px;

Utility mixins

Utility mixins are mixins that combine otherwise unrelated CSS properties to achieve a specific goal or task. In our case you will find backgrounds and sizes for buttons, navigations, modules, badges and form elements.

Horizontal centering

Quickly center any element within its parent. Requires width or max-width to be set.

// Mixin
.center-block() {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

// Usage
.container {
  width: 940px;
  .center-block();
}