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| author | XhmikosR <[email protected]> | 2021-01-19 08:34:18 +0200 |
|---|---|---|
| committer | XhmikosR <[email protected]> | 2021-01-19 18:20:37 +0200 |
| commit | 0bb8f991a032ff984f45ede26b53643ffa93891b (patch) | |
| tree | b5c124360151f417b9a4c15f2a5a6f9e4389095c /docs/4.6/layout/overview | |
| parent | b298dc0b34fd1ca73e8aa83e57fac4151bfbc3db (diff) | |
| download | bootstrap-0bb8f991a032ff984f45ede26b53643ffa93891b.tar.xz bootstrap-0bb8f991a032ff984f45ede26b53643ffa93891b.zip | |
Add v4.6.0 docs
Diffstat (limited to 'docs/4.6/layout/overview')
| -rw-r--r-- | docs/4.6/layout/overview/index.html | 473 |
1 files changed, 473 insertions, 0 deletions
diff --git a/docs/4.6/layout/overview/index.html b/docs/4.6/layout/overview/index.html new file mode 100644 index 000000000..bc29fdf2c --- /dev/null +++ b/docs/4.6/layout/overview/index.html @@ -0,0 +1,473 @@ +<!doctype html> +<html lang="en"> + <head> + <meta charset="utf-8"> +<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> +<meta name="description" content="Components and options for laying out your Bootstrap project, including wrapping containers, a powerful grid system, a flexible media object, and responsive utility classes."> +<meta name="author" content="Mark Otto, Jacob Thornton, and Bootstrap contributors"> +<meta name="generator" content="Hugo 0.80.0"> + +<meta name="docsearch:language" content="en"> +<meta name="docsearch:version" content="4.6"> + +<title>Overview · Bootstrap v4.6</title> + +<link rel="canonical" href="https://getbootstrap.com/docs/4.6/layout/overview/"> + + + +<!-- Bootstrap core CSS --> +<link href="/docs/4.6/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l" crossorigin="anonymous"> + +<!-- Documentation extras --> +<link href="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.css" rel="stylesheet"> + +<link href="/docs/4.6/assets/css/docs.css" rel="stylesheet"> + +<!-- Favicons --> +<link rel="apple-touch-icon" href="/docs/4.6/assets/img/favicons/apple-touch-icon.png" sizes="180x180"> +<link rel="icon" href="/docs/4.6/assets/img/favicons/favicon-32x32.png" sizes="32x32" type="image/png"> +<link rel="icon" href="/docs/4.6/assets/img/favicons/favicon-16x16.png" sizes="16x16" type="image/png"> +<link rel="manifest" href="/docs/4.6/assets/img/favicons/manifest.json"> +<link rel="mask-icon" href="/docs/4.6/assets/img/favicons/safari-pinned-tab.svg" color="#563d7c"> +<link rel="icon" href="/docs/4.6/assets/img/favicons/favicon.ico"> +<meta name="msapplication-config" 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responsive utility classes."> +<meta property="og:type" content="article"> +<meta property="og:image" content="https://getbootstrap.com/docs/4.6/assets/brand/bootstrap-social.png"> +<meta property="og:image:type" content="image/png"> +<meta property="og:image:width" content="1200"> +<meta property="og:image:height" content="630"> + +<script> + window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date; + ga('create', 'UA-146052-10', 'getbootstrap.com'); + ga('set', 'anonymizeIp', true); + ga('send', 'pageview'); +</script> +<script async src="https://www.google-analytics.com/analytics.js"></script> + + + </head> + <body> + <div class="skippy overflow-hidden"> + <div class="container-xl"> + <a class="sr-only sr-only-focusable d-inline-flex p-2 m-1" href="#content">Skip to main content</a> + <a class="sr-only sr-only-focusable d-none d-md-inline-flex p-2 m-1" href="#bd-docs-nav">Skip to docs navigation</a> + </div> +</div> + + + <header class="navbar navbar-expand 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0c48.87-33.13 70.33-26.24 70.33-26.24 14 35.25 5.18 61.27 2.55 67.75 16.41 17.9 26.31 40.75 26.31 68.69 0 98.35-59.85 120-116.88 126.32 9.19 7.9 17.38 23.53 17.38 47.41 0 34.22-.31 61.83-.31 70.23 0 6.85 4.61 14.81 17.6 12.31C438.72 464.97 512 369.08 512 256.02 512 114.62 397.37 0 256 0z"/></svg> + </a> + </li> + <li class="nav-item"> + <a class="nav-link px-1 mx-1 py-3 my-n2" href="https://twitter.com/getbootstrap" target="_blank" rel="noopener" aria-label="Twitter"> + <svg xmlns="http://www.w3.org/2000/svg" class="navbar-nav-svg" viewBox="0 0 512 416.32" role="img" focusable="false"><title>Twitter</title><path fill="currentColor" d="M160.83 416.32c193.2 0 298.92-160.22 298.92-298.92 0-4.51 0-9-.2-13.52A214 214 0 0 0 512 49.38a212.93 212.93 0 0 1-60.44 16.6 105.7 105.7 0 0 0 46.3-58.19 209 209 0 0 1-66.79 25.37 105.09 105.09 0 0 0-181.73 71.91 116.12 116.12 0 0 0 2.66 24c-87.28-4.3-164.73-46.3-216.56-109.82A105.48 105.48 0 0 0 68 159.6a106.27 106.27 0 0 1-47.53-13.11v1.43a105.28 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width="30" height="30" viewBox="0 0 30 30" role="img" focusable="false"><title>Menu</title><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"/></svg> + </button> +</form> + +<div class="collapse d-md-block row" id="bd-docs-nav"> + <nav class="bd-links" aria-label="Main navigation"> + + <div class="bd-toc-item"> + <a class="bd-toc-link" href="/docs/4.6/getting-started/introduction/"> + Getting started + </a> + </div> + + <div class="bd-toc-item active"> + <a class="bd-toc-link" href="/docs/4.6/layout/overview/"> + Layout + </a> + <ul class="nav bd-sidenav"> + <li class="active bd-sidenav-active"> + <a href="/docs/4.6/layout/overview/">Overview</a> + </li> + <li> + <a href="/docs/4.6/layout/grid/">Grid</a> + </li> + <li> + <a href="/docs/4.6/layout/utilities-for-layout/">Utilities for layout</a> + </li> + </ul> + </div> + + <div class="bd-toc-item"> + <a class="bd-toc-link" href="/docs/4.6/content/reboot/"> + Content + </a> + </div> + + <div class="bd-toc-item"> + <a class="bd-toc-link" href="/docs/4.6/components/alerts/"> + Components + </a> + </div> + + <div class="bd-toc-item"> + <a class="bd-toc-link" href="/docs/4.6/utilities/borders/"> + Utilities + </a> + </div> + + <div class="bd-toc-item"> + <a class="bd-toc-link" href="/docs/4.6/extend/approach/"> + Extend + </a> + </div> + + <div class="bd-toc-item"> + <a class="bd-toc-link" href="/docs/4.6/migration/"> + Migration + </a> + </div> + + <div class="bd-toc-item"> + <a class="bd-toc-link" href="/docs/4.6/about/overview/"> + About + </a> + </div> + </nav> +</div> + + </div> + + + <nav class="d-none d-xl-block col-xl-2 bd-toc" aria-label="Secondary navigation"> + <nav id="TableOfContents"> + <ul> + <li><a href="#containers">Containers</a> + <ul> + <li><a href="#all-in-one">All-in-one</a></li> + <li><a href="#fluid">Fluid</a></li> + <li><a href="#responsive">Responsive</a></li> + </ul> + </li> + <li><a href="#responsive-breakpoints">Responsive breakpoints</a></li> + <li><a href="#z-index">Z-index</a></li> + </ul> +</nav> + </nav> + + + <main class="col-md-9 col-xl-8 py-md-3 pl-md-5 bd-content" role="main"> + <div class="d-md-flex flex-md-row-reverse align-items-center justify-content-between"> + <a class="btn btn-sm btn-bd-light my-2 my-md-0" href="https://github.com/twbs/bootstrap/blob/v4-dev/site/content/docs/4.6/layout/overview.md" title="View and edit this file on GitHub" target="_blank" rel="noopener">View on GitHub</a> + <h1 class="bd-title" id="content">Overview</h1> + </div> + <p class="bd-lead">Components and options for laying out your Bootstrap project, including wrapping containers, a powerful grid system, a flexible media object, and responsive utility classes.</p> + <script async src="https://cdn.carbonads.com/carbon.js?serve=CKYIKKJL&placement=getbootstrapcom" id="_carbonads_js"></script> + + <h2 id="containers">Containers</h2> +<p>Containers are the most basic layout element in Bootstrap and are <strong>required when using our default grid system</strong>. Containers are used to contain, pad, and (sometimes) center the content within them. While containers <em>can</em> be nested, most layouts do not require a nested container.</p> +<p>Bootstrap comes with three different containers:</p> +<ul> +<li><code>.container</code>, which sets a <code>max-width</code> at each responsive breakpoint</li> +<li><code>.container-fluid</code>, which is <code>width: 100%</code> at all breakpoints</li> +<li><code>.container-{breakpoint}</code>, which is <code>width: 100%</code> until the specified breakpoint</li> +</ul> +<p>The table below illustrates how each container’s <code>max-width</code> compares to the original <code>.container</code> and <code>.container-fluid</code> across each breakpoint.</p> +<p>See them in action and compare them in our <a href="/docs/4.6/examples/grid/#containers">Grid example</a>.</p> +<table class="table"> + <thead> + <tr> + <th></th> + <th> + Extra small<br> + <span class="font-weight-normal"><576px</span> + </th> + <th> + Small<br> + <span class="font-weight-normal">≥576px</span> + </th> + <th> + Medium<br> + <span class="font-weight-normal">≥768px</span> + </th> + <th> + Large<br> + <span class="font-weight-normal">≥992px</span> + </th> + <th> + Extra large<br> + <span class="font-weight-normal">≥1200px</span> + </th> + </tr> + </thead> + <tbody> + <tr> + <td><code>.container</code></td> + <td class="text-muted">100%</td> + <td>540px</td> + <td>720px</td> + <td>960px</td> + <td>1140px</td> + </tr> + <tr> + <td><code>.container-sm</code></td> + <td class="text-muted">100%</td> + <td>540px</td> + <td>720px</td> + <td>960px</td> + <td>1140px</td> + </tr> + <tr> + <td><code>.container-md</code></td> + <td class="text-muted">100%</td> + <td class="text-muted">100%</td> + <td>720px</td> + <td>960px</td> + <td>1140px</td> + </tr> + <tr> + <td><code>.container-lg</code></td> + <td class="text-muted">100%</td> + <td class="text-muted">100%</td> + <td class="text-muted">100%</td> + <td>960px</td> + <td>1140px</td> + </tr> + <tr> + <td><code>.container-xl</code></td> + <td class="text-muted">100%</td> + <td class="text-muted">100%</td> + <td class="text-muted">100%</td> + <td class="text-muted">100%</td> + <td>1140px</td> + </tr> + <tr> + <td><code>.container-fluid</code></td> + <td class="text-muted">100%</td> + <td class="text-muted">100%</td> + <td class="text-muted">100%</td> + <td class="text-muted">100%</td> + <td class="text-muted">100%</td> + </tr> + </tbody> +</table> +<h3 id="all-in-one">All-in-one</h3> +<p>Our default <code>.container</code> class is a responsive, fixed-width container, meaning its <code>max-width</code> changes at each breakpoint.</p> +<div class="highlight"><pre class="chroma"><code class="language-html" data-lang="html"><span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"container"</span><span class="p">></span> + <span class="c"><!-- Content here --></span> +<span class="p"></</span><span class="nt">div</span><span class="p">></span> +</code></pre></div><h3 id="fluid">Fluid</h3> +<p>Use <code>.container-fluid</code> for a full width container, spanning the entire width of the viewport.</p> +<div class="highlight"><pre class="chroma"><code class="language-html" data-lang="html"><span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"container-fluid"</span><span class="p">></span> + ... +<span class="p"></</span><span class="nt">div</span><span class="p">></span> +</code></pre></div><h3 id="responsive">Responsive</h3> +<p>Responsive containers are new in Bootstrap v4.4. They allow you to specify a class that is 100% wide until the specified breakpoint is reached, after which we apply <code>max-width</code>s for each of the higher breakpoints. For example, <code>.container-sm</code> is 100% wide to start until the <code>sm</code> breakpoint is reached, where it will scale up with <code>md</code>, <code>lg</code>, and <code>xl</code>.</p> +<div class="highlight"><pre class="chroma"><code class="language-html" data-lang="html"><span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"container-sm"</span><span class="p">></span>100% wide until small breakpoint<span class="p"></</span><span class="nt">div</span><span class="p">></span> +<span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"container-md"</span><span class="p">></span>100% wide until medium breakpoint<span class="p"></</span><span class="nt">div</span><span class="p">></span> +<span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"container-lg"</span><span class="p">></span>100% wide until large breakpoint<span class="p"></</span><span class="nt">div</span><span class="p">></span> +<span class="p"><</span><span class="nt">div</span> <span class="na">class</span><span class="o">=</span><span class="s">"container-xl"</span><span class="p">></span>100% wide until extra large breakpoint<span class="p"></</span><span class="nt">div</span><span class="p">></span> +</code></pre></div><h2 id="responsive-breakpoints">Responsive breakpoints</h2> +<p>Since Bootstrap is developed to be mobile first, we use a handful of <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries">media queries</a> to create sensible breakpoints for our layouts and interfaces. These breakpoints are mostly based on minimum viewport widths and allow us to scale up elements as the viewport changes.</p> +<p>Bootstrap primarily uses the following media query ranges—or breakpoints—in our source Sass files for our layout, grid system, and components.</p> +<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="c1">// Extra small devices (portrait phones, less than 576px) +</span><span class="c1">// No media query for `xs` since this is the default in Bootstrap +</span><span class="c1"></span> +<span class="c1">// Small devices (landscape phones, 576px and up) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">min-width</span><span class="o">:</span> <span class="mi">576</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> + +<span class="c1">// Medium devices (tablets, 768px and up) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">min-width</span><span class="o">:</span> <span class="mi">768</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> + +<span class="c1">// Large devices (desktops, 992px and up) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">min-width</span><span class="o">:</span> <span class="mi">992</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> + +<span class="c1">// Extra large devices (large desktops, 1200px and up) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">min-width</span><span class="o">:</span> <span class="mi">1200</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +</code></pre></div><p>Since we write our source CSS in Sass, all our media queries are available via Sass mixins:</p> +<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="c1">// No media query necessary for xs breakpoint as it's effectively `@media (min-width: 0) { ... }` +</span><span class="c1"></span><span class="k">@include</span><span class="nd"> media-breakpoint-up</span><span class="p">(</span><span class="n">sm</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +<span class="k">@include</span><span class="nd"> media-breakpoint-up</span><span class="p">(</span><span class="n">md</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +<span class="k">@include</span><span class="nd"> media-breakpoint-up</span><span class="p">(</span><span class="n">lg</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +<span class="k">@include</span><span class="nd"> media-breakpoint-up</span><span class="p">(</span><span class="n">xl</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> + +<span class="c1">// Example: Hide starting at `min-width: 0`, and then show at the `sm` breakpoint +</span><span class="c1"></span><span class="nc">.custom-class</span> <span class="p">{</span> + <span class="nt">display</span><span class="nd">:</span> <span class="nt">none</span><span class="p">;</span> +<span class="p">}</span> +<span class="k">@include</span><span class="nd"> media-breakpoint-up</span><span class="p">(</span><span class="n">sm</span><span class="p">)</span> <span class="p">{</span> + <span class="nc">.custom-class</span> <span class="p">{</span> + <span class="nt">display</span><span class="nd">:</span> <span class="nt">block</span><span class="p">;</span> + <span class="p">}</span> +<span class="p">}</span> +</code></pre></div><p>We occasionally use media queries that go in the other direction (the given screen size <em>or smaller</em>):</p> +<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="c1">// Extra small devices (portrait phones, less than 576px) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">max-width</span><span class="o">:</span> <span class="mi">575</span><span class="mf">.98</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> + +<span class="c1">// Small devices (landscape phones, less than 768px) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">max-width</span><span class="o">:</span> <span class="mi">767</span><span class="mf">.98</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> + +<span class="c1">// Medium devices (tablets, less than 992px) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">max-width</span><span class="o">:</span> <span class="mi">991</span><span class="mf">.98</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> + +<span class="c1">// Large devices (desktops, less than 1200px) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">max-width</span><span class="o">:</span> <span class="mi">1199</span><span class="mf">.98</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> + +<span class="c1">// Extra large devices (large desktops) +</span><span class="c1">// No media query since the extra-large breakpoint has no upper bound on its width +</span></code></pre></div><div class="bd-callout bd-callout-info"> +Note that since browsers do not currently support <a href="https://www.w3.org/TR/mediaqueries-4/#range-context">range context queries</a>, we work around the limitations of <a href="https://www.w3.org/TR/mediaqueries-4/#mq-min-max"><code>min-</code> and <code>max-</code> prefixes</a> and viewports with fractional widths (which can occur under certain conditions on high-dpi devices, for instance) by using values with higher precision for these comparisons. +</div> + +<p>Once again, these media queries are also available via Sass mixins:</p> +<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="k">@include</span><span class="nd"> media-breakpoint-down</span><span class="p">(</span><span class="n">xs</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +<span class="k">@include</span><span class="nd"> media-breakpoint-down</span><span class="p">(</span><span class="n">sm</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +<span class="k">@include</span><span class="nd"> media-breakpoint-down</span><span class="p">(</span><span class="n">md</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +<span class="k">@include</span><span class="nd"> media-breakpoint-down</span><span class="p">(</span><span class="n">lg</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +<span class="c1">// No media query necessary for xl breakpoint as it has no upper bound on its width +</span><span class="c1"></span> +<span class="c1">// Example: Style from medium breakpoint and down +</span><span class="c1"></span><span class="k">@include</span><span class="nd"> media-breakpoint-down</span><span class="p">(</span><span class="n">md</span><span class="p">)</span> <span class="p">{</span> + <span class="nc">.custom-class</span> <span class="p">{</span> + <span class="nt">display</span><span class="nd">:</span> <span class="nt">block</span><span class="p">;</span> + <span class="p">}</span> +<span class="p">}</span> +</code></pre></div><p>There are also media queries and mixins for targeting a single segment of screen sizes using the minimum and maximum breakpoint widths.</p> +<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="c1">// Extra small devices (portrait phones, less than 576px) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">max-width</span><span class="o">:</span> <span class="mi">575</span><span class="mf">.98</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> + +<span class="c1">// Small devices (landscape phones, 576px and up) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">min-width</span><span class="o">:</span> <span class="mi">576</span><span class="kt">px</span><span class="p">)</span> <span class="ow">and</span> <span class="p">(</span><span class="no">max-width</span><span class="o">:</span> <span class="mi">767</span><span class="mf">.98</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> + +<span class="c1">// Medium devices (tablets, 768px and up) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">min-width</span><span class="o">:</span> <span class="mi">768</span><span class="kt">px</span><span class="p">)</span> <span class="ow">and</span> <span class="p">(</span><span class="no">max-width</span><span class="o">:</span> <span class="mi">991</span><span class="mf">.98</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> + +<span class="c1">// Large devices (desktops, 992px and up) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">min-width</span><span class="o">:</span> <span class="mi">992</span><span class="kt">px</span><span class="p">)</span> <span class="ow">and</span> <span class="p">(</span><span class="no">max-width</span><span class="o">:</span> <span class="mi">1199</span><span class="mf">.98</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> + +<span class="c1">// Extra large devices (large desktops, 1200px and up) +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">min-width</span><span class="o">:</span> <span class="mi">1200</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +</code></pre></div><p>These media queries are also available via Sass mixins:</p> +<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="k">@include</span><span class="nd"> media-breakpoint-only</span><span class="p">(</span><span class="n">xs</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +<span class="k">@include</span><span class="nd"> media-breakpoint-only</span><span class="p">(</span><span class="n">sm</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +<span class="k">@include</span><span class="nd"> media-breakpoint-only</span><span class="p">(</span><span class="n">md</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +<span class="k">@include</span><span class="nd"> media-breakpoint-only</span><span class="p">(</span><span class="n">lg</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +<span class="k">@include</span><span class="nd"> media-breakpoint-only</span><span class="p">(</span><span class="n">xl</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +</code></pre></div><p>Similarly, media queries may span multiple breakpoint widths:</p> +<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="c1">// Example +</span><span class="c1">// Apply styles starting from medium devices and up to extra large devices +</span><span class="c1"></span><span class="k">@media</span> <span class="p">(</span><span class="no">min-width</span><span class="o">:</span> <span class="mi">768</span><span class="kt">px</span><span class="p">)</span> <span class="ow">and</span> <span class="p">(</span><span class="no">max-width</span><span class="o">:</span> <span class="mi">1199</span><span class="mf">.98</span><span class="kt">px</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +</code></pre></div><p>The Sass mixin for targeting the same screen size range would be:</p> +<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="k">@include</span><span class="nd"> media-breakpoint-between</span><span class="p">(</span><span class="n">md</span><span class="o">,</span> <span class="n">xl</span><span class="p">)</span> <span class="p">{</span> <span class="nc">...</span> <span class="p">}</span> +</code></pre></div><h2 id="z-index">Z-index</h2> +<p>Several Bootstrap components utilize <code>z-index</code>, the CSS property that helps control layout by providing a third axis to arrange content. We utilize a default z-index scale in Bootstrap that’s been designed to properly layer navigation, tooltips and popovers, modals, and more.</p> +<p>These higher values start at an arbitrary number, high and specific enough to ideally avoid conflicts. We need a standard set of these across our layered components—tooltips, popovers, navbars, dropdowns, modals—so we can be reasonably consistent in the behaviors. There’s no reason we couldn’t have used <code>100</code>+ or <code>500</code>+.</p> +<p>We don’t encourage customization of these individual values; should you change one, you likely need to change them all.</p> +<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="nv">$zindex-dropdown</span><span class="o">:</span> <span class="mi">1000</span> <span class="nv">!default</span><span class="p">;</span> +<span class="nv">$zindex-sticky</span><span class="o">:</span> <span class="mi">1020</span> <span class="nv">!default</span><span class="p">;</span> +<span class="nv">$zindex-fixed</span><span class="o">:</span> <span class="mi">1030</span> <span class="nv">!default</span><span class="p">;</span> +<span class="nv">$zindex-modal-backdrop</span><span class="o">:</span> <span class="mi">1040</span> <span class="nv">!default</span><span class="p">;</span> +<span class="nv">$zindex-modal</span><span class="o">:</span> <span class="mi">1050</span> <span class="nv">!default</span><span class="p">;</span> +<span class="nv">$zindex-popover</span><span class="o">:</span> <span class="mi">1060</span> <span class="nv">!default</span><span class="p">;</span> +<span class="nv">$zindex-tooltip</span><span class="o">:</span> <span class="mi">1070</span> <span class="nv">!default</span><span class="p">;</span> +</code></pre></div><p>To handle overlapping borders within components (e.g., buttons and inputs in input groups), we use low single digit <code>z-index</code> values of <code>1</code>, <code>2</code>, and <code>3</code> for default, hover, and active states. On hover/focus/active, we bring a particular element to the forefront with a higher <code>z-index</code> value to show their border over the sibling elements.</p> + + </main> + </div> + </div> + + <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script> +<script>window.jQuery || document.write('<script src="/docs/4.6/assets/js/vendor/jquery.slim.min.js"><\/script>')</script> + +<script src="/docs/4.6/dist/js/bootstrap.bundle.min.js" integrity="sha384-Piv4xVNRyMGpqkS2by6br4gNJ7DXjqk09RmUpJ8jgGtD7zP9yug3goQfGII0yAns" crossorigin="anonymous"></script> + + +<script src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js"></script> + +<script src="/docs/4.6/assets/js/docs.min.js"></script> + + </body> +</html> |