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----
-layout: docs
-title: Utility classes
-group: components
----
-
-Bootstrap includes dozens of utilities—classes with a single purpose. They're designed to reduce the frequency of highly repetitive declarations in your CSS while allowing for quick and easy development.
-
-## Contents
-
-* Will be replaced with the ToC, excluding the "Contents" header
-{:toc}
-
-## Spacing
-
-Assign `margin` or `padding` to an element or a subset of its sides with shorthand classes. Includes support for individual properties, all properties, and vertical and horizontal properties. All classes are multiples on the global default value, `1rem`.
-
-The classes are named using the format: `{property}-{sides}-{size}`
-
-Where *property* is one of:
-
-* `m` - for classes that set `margin`
-* `p` - for classes that set `padding`
-
-Where *sides* is one of:
-
-* `t` - for classes that set `margin-top` or `padding-top`
-* `b` - for classes that set `margin-bottom` or `padding-bottom`
-* `l` - for classes that set `margin-left` or `padding-left`
-* `r` - for classes that set `margin-right` or `padding-right`
-* `x` - for classes that set both `*-left` and `*-right`
-* `y` - for classes that set both `*-top` and `*-bottom`
-* `a` - for classes that set a `margin` or `padding` on all 4 sides of the element
-
-Where *size* is one of:
-
-* `0` - for classes that eliminate the `margin` or `padding` by setting it to `0`
-* `1` - (by default) for classes that set the `margin` or `padding` to `$spacer-x` or `$spacer-y`
-* `2` - (by default) for classes that set the `margin` or `padding` to `$spacer-x * 1.5` or `$spacer-y * 1.5`
-* `3` - (by default) for classes that set the `margin` or `padding` to `$spacer-x * 3` or `$spacer-y * 3`
-
-(You can add more sizes by adding entries to the `$spacers` Sass map variable.)
-
-Here are some representative examples of these classes:
-
-{% highlight scss %}
-.m-t-0 {
-  margin-top: 0 !important;
-}
-
-.m-l-1 {
-  margin-left: $spacer-x !important;
-}
-
-.p-x-2 {
-  padding-left: ($spacer-x * 1.5) !important;
-  padding-right: ($spacer-x * 1.5) !important;
-}
-
-.p-a-3 {
-  padding: ($spacer-y * 3) ($spacer-x * 3) !important;
-}
-{% endhighlight %}
-
-### Horizontal centering
-Additionally, Bootstrap also includes an `.m-x-auto` class for horizontally centering fixed-width block level content by setting the horizontal margins to `auto`.
-
-<div class="bd-example">
-  <div class="m-x-auto" style="width: 200px; background-color: rgba(86,61,124,.15);">
-    Centered element
-  </div>
-</div>
-
-{% highlight html %}
-<div class="m-x-auto" style="width: 200px;">
-  Centered element
-</div>
-{% endhighlight %}
-
-## Text alignment
-
-Easily realign text to components with text alignment classes.
-
-{% example html %}
-<p class="text-justify">Justified text.</p>
-<p class="text-nowrap">No wrap text.</p>
-{% endexample %}
-
-For left, right, and center alignment, responsive classes are available that use the same viewport width breakpoints as the grid system.
-
-{% example html %}
-<p class="text-xs-left">Left aligned text on all viewport sizes.</p>
-<p class="text-xs-center">Center aligned text on all viewport sizes.</p>
-<p class="text-xs-right">Right aligned text on all viewport sizes.</p>
-
-<p class="text-sm-left">Left aligned text on viewports sized SM (small) or wider.</p>
-<p class="text-md-left">Left aligned text on viewports sized MD (medium) or wider.</p>
-<p class="text-lg-left">Left aligned text on viewports sized LG (large) or wider.</p>
-<p class="text-xl-left">Left aligned text on viewports sized XL (extra-large) or wider.</p>
-{% endexample %}
-
-## Text transform
-
-Transform text in components with text capitalization classes.
-
-{% example html %}
-<p class="text-lowercase">Lowercased text.</p>
-<p class="text-uppercase">Uppercased text.</p>
-<p class="text-capitalize">CapiTaliZed text.</p>
-{% endexample %}
-
-Note how `text-capitalize` only changes the first letter of each word, leaving the case of any other letters unaffected.
-
-## Font weight and italics
-
-Quickly change the weight (boldness) of text or italicize text.
-
-{% example html %}
-<p class="font-weight-bold">Bold text.</p>
-<p class="font-weight-normal">Normal weight text.</p>
-<p class="font-italic">Italic text.</p>
-{% endexample %}
-
-## Contextual colors and backgrounds
-
-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.
-
-{% example html %}
-<p class="text-muted">Fusce dapibus, tellus ac cursus commodo, tortor mauris nibh.</p>
-<p class="text-primary">Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
-<p class="text-success">Duis mollis, est non commodo luctus, nisi erat porttitor ligula.</p>
-<p class="text-info">Maecenas sed diam eget risus varius blandit sit amet non magna.</p>
-<p class="text-warning">Etiam porta sem malesuada magna mollis euismod.</p>
-<p class="text-danger">Donec ullamcorper nulla non metus auctor fringilla.</p>
-{% endexample %}
-
-Contextual text classes also work well on anchors with the provided hover and focus states.
-
-{% example html %}
-<a href="#" class="text-muted">Muted link</a>
-<a href="#" class="text-primary">Primary link</a>
-<a href="#" class="text-success">Success link</a>
-<a href="#" class="text-info">Info link</a>
-<a href="#" class="text-warning">Warning link</a>
-<a href="#" class="text-danger">Danger link</a>
-{% endexample %}
-
-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.
-
-{% example html %}
-<div class="bg-primary">Nullam id dolor id nibh ultricies vehicula ut id elit.</div>
-<div class="bg-success">Duis mollis, est non commodo luctus, nisi erat porttitor ligula.</div>
-<div class="bg-info">Maecenas sed diam eget risus varius blandit sit amet non magna.</div>
-<div class="bg-warning">Etiam porta sem malesuada magna mollis euismod.</div>
-<div class="bg-danger">Donec ullamcorper nulla non metus auctor fringilla.</div>
-<div class="bg-inverse">Cras mattis consectetur purus sit amet fermentum.</div>
-{% endexample %}
-
-{% callout info %}
-#### Dealing with specificity
-
-Sometimes contextual classes cannot be applied due to the specificity of another selector. In some cases, a sufficient workaround is to wrap your element's content in a `<div>` with the class.
-{% endcallout %}
-
-{% capture callout-include %}{% include callout-warning-color-assistive-technologies.md %}{% endcapture %}
-{{ callout-include | markdownify }}
-
-## Widths
-
-Easily make an element as wide as its parent using the `.w-100` utility class, which sets `width: 100%`.
-
-{% example html %}
-<img class="w-100" data-src="holder.js/200px100?outline=yes&text=Width%20%3D%20100%25" alt="Width = 100%">
-{% endexample %}
-
-## CSS `display` (`block`, `inline`, `inline-block`)
-
-Use `.d-block`, `.d-inline`, or `.d-inline-block` to simply set an element's [`display` property](https://developer.mozilla.org/en-US/docs/Web/CSS/display) to `block`, `inline`, or `inline-block` (respectively).
-
-To make an element `display: none`, use our [responsive utilities](../layout/responsive-utilities/) instead.
-
-{% example html %}
-<div class="d-inline bg-success">Inline</div>
-<div class="d-inline bg-success">Inline</div>
-
-<span class="d-block bg-primary">Block</span>
-
-<div class="d-inline-block bg-warning">
-  <h3>inline-block</h3>
-  Boot that strap!
-</div>
-<div class="d-inline-block bg-warning">
-  <h3>inline-block</h3>
-  Strap that boot!
-</div>
-{% endexample %}
-
-## Close icon
-
-Use a generic close icon for dismissing content like modals and alerts. **Be sure to include text for screen readers**, as we've done with `aria-label`.
-
-{% example html %}
-<button type="button" class="close" aria-label="Close">
-  <span aria-hidden="true">&times;</span>
-</button>
-{% endexample %}
-
-## Responsive floats
-
-These utility classes float an element to the left or right, or disable floating, based on the current viewport size using the [CSS `float` property](https://developer.mozilla.org/en-US/docs/Web/CSS/float). `!important` is included to avoid specificity issues. These use the same viewport width breakpoints as the grid system.
-
-Two similar non-responsive mixins (`pull-left` and `pull-right`) are also available.
-
-{% example html %}
-<div class="pull-xs-left">Float left on all viewport sizes</div><br>
-<div class="pull-xs-right">Float right on all viewport sizes</div><br>
-<div class="pull-xs-none">Don't float on all viewport sizes</div><br>
-
-<div class="pull-sm-left">Float left on viewports sized SM (small) or wider</div><br>
-<div class="pull-md-left">Float left on viewports sized MD (medium) or wider</div><br>
-<div class="pull-lg-left">Float left on viewports sized LG (large) or wider</div><br>
-<div class="pull-xl-left">Float left on viewports sized XL (extra-large) or wider</div><br>
-{% endexample %}
-
-{% highlight scss %}
-// Related simple non-responsive mixins
-.element {
-  @include pull-left;
-}
-.another-element {
-  @include pull-right;
-}
-{% endhighlight %}
-
-## Clearfix
-
-Easily clear `float`s by adding `.clearfix` **to the parent element**. Utilizes [the micro clearfix](http://nicolasgallagher.com/micro-clearfix-hack/) as popularized by Nicolas Gallagher. Can also be used as a mixin.
-
-{% highlight html %}
-<div class="clearfix">...</div>
-{% endhighlight %}
-
-{% highlight scss %}
-// Mixin itself
-.clearfix() {
-  &:before,
-  &:after {
-    content: " ";
-    display: table;
-  }
-  &:after {
-    clear: both;
-  }
-}
-
-// Usage as a mixin
-.element {
-  @include clearfix;
-}
-{% endhighlight %}
-
-## Fixed positioning
-
-The `.pos-f-t` class can be used to easily position elements at the top of the viewport and make them as wide as the viewport. **Be sure you understand the ramifications of fixed-position elements within your project.** Here's how the class is defined:
-
-{% highlight scss %}
-.pos-f-t {
-  position: fixed;
-  top: 0;
-  right: 0;
-  left: 0;
-  z-index: $zindex-navbar-fixed;
-}
-{% endhighlight %}
-
-## Invisible content
-
-The `.invisible` class 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.
-
-{% highlight html %}
-<div class="invisible">...</div>
-{% endhighlight %}
-
-{% highlight scss %}
-// Class
-.invisible {
-  visibility: hidden;
-}
-
-// Usage as a mixin
-.element {
-  @include invisible;
-}
-{% endhighlight %}
-
-## Screen readers and keyboard users
-
-Hide an element to all devices **except screen readers** with `.sr-only`. Combine `.sr-only` with `.sr-only-focusable` to show the element again when it's focused (e.g. by a keyboard-only user). Can also be used as mixins.
-
-{% comment %}
-Necessary for following [accessibility best practices](../getting-started/#accessibility).
-{% endcomment %}
-
-{% highlight html %}
-<a class="sr-only sr-only-focusable" href="#content">Skip to main content</a>
-{% endhighlight %}
-
-{% highlight scss %}
-// Usage as a mixin
-.skip-navigation {
-  @include sr-only;
-  @include sr-only-focusable;
-}
-{% endhighlight %}
-
-## Image replacement
-
-Utilize the `.text-hide` class or mixin to help replace an element's text content with a background image.
-
-{% highlight html %}
-<h1 class="text-hide">Custom heading</h1>
-{% endhighlight %}
-
-{% highlight scss %}
-// Usage as a mixin
-.heading {
-  @include text-hide;
-}
-{% endhighlight %}
-
-## Responsive embeds
-
-Allow browsers to determine video or slideshow dimensions based on the width of their containing block by creating an intrinsic ratio that will properly scale on any device.
-
-Rules are directly applied to `<iframe>`, `<embed>`, `<video>`, and `<object>` elements; optionally use an explicit descendant class `.embed-responsive-item` when you want to match the styling for other attributes.
-
-**Pro-Tip!** You don't need to include `frameborder="0"` in your `<iframe>`s as we override that for you.
-
-{% example html %}
-<div class="embed-responsive embed-responsive-16by9">
-  <iframe class="embed-responsive-item" src="//www.youtube.com/embed/zpOULjyy-n8?rel=0" allowfullscreen></iframe>
-</div>
-{% endexample %}
-
-Aspect ratios can be customized with modifier classes.
-
-{% highlight html %}
-<!-- 21:9 aspect ratio -->
-<div class="embed-responsive embed-responsive-21by9">
-  <iframe class="embed-responsive-item" src="..."></iframe>
-</div>
-
-<!-- 16:9 aspect ratio -->
-<div class="embed-responsive embed-responsive-16by9">
-  <iframe class="embed-responsive-item" src="..."></iframe>
-</div>
-
-<!-- 4:3 aspect ratio -->
-<div class="embed-responsive embed-responsive-4by3">
-  <iframe class="embed-responsive-item" src="..."></iframe>
-</div>
-
-<!-- 1:1 aspect ratio -->
-<div class="embed-responsive embed-responsive-1by1">
-  <iframe class="embed-responsive-item" src="..."></iframe>
-</div>
-{% endhighlight %}