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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>30 Seconds of CSS</title>
<meta name="description" content="A curated collection of useful CSS snippets you can understand in 30 seconds or less. From foundational elements such as clearfix to gradient text color and gradient cursor tracking to CSS easing and far beyond.">
<link rel="icon" type="image/png" sizes="32x32" href="./favicon-32x32.png">
<script src="./src/js/index.js" defer=""></script>
<script async="" defer="" src="https://buttons.github.io/buttons.js"></script>
</head>
<body>
<button class="back-to-top-button" aria-label="back to top">
<i data-feather="arrow-up"></i>
</button>
<nav class="sidebar" aria-label="Table of Contents">
<button class="hamburger hamburger--spin sidebar__menu" type="button" aria-label="Menu" aria-expanded="false">
<span class="hamburger-box">
<span class="hamburger-inner"></span>
</span>
</button>
<div class="sidebar__links">
<section data-type="layout" class="sidebar__section">
<h4 class="sidebar__section-heading">layout</h4>
<a class="sidebar__link" href="#box-sizing-reset"><span>Box-sizing reset</span></a>
<a class="sidebar__link" href="#clearfix"><span>Clearfix</span></a>
<a class="sidebar__link" href="#constant-width-to-height-ratio"><span>Constant width to height ratio</span></a>
<a class="sidebar__link" href="#evenly-distributed-children"><span>Evenly distributed children</span></a>
<a class="sidebar__link" href="#flexbox-centering"><span>Flexbox centering</span></a>
<a class="sidebar__link" href="#grid-centering"><span>Grid centering</span></a>
<a class="sidebar__link" href="#grid-layout"><span>Grid layout</span></a>
<a class="sidebar__link" href="#truncate-text"><span>Truncate text</span></a>
</section>
<section data-type="visual" class="sidebar__section">
<h4 class="sidebar__section-heading">visual</h4>
<a class="sidebar__link" href="#circle"><span>Circle</span></a>
<a class="sidebar__link" href="#custom-scrollbar"><span>Custom scrollbar</span></a>
<a class="sidebar__link" href="#custom-text-selection"><span>Custom text selection</span></a>
<a class="sidebar__link" href="#dynamic-shadow"><span>Dynamic shadow</span></a>
<a class="sidebar__link" href="#etched-text"><span>Etched text</span></a>
<a class="sidebar__link" href="#gradient-text"><span>Gradient text</span></a>
<a class="sidebar__link" href="#hairline-border"><span>Hairline border</span></a>
<a class="sidebar__link" href="#overflow-scroll-gradient"><span>Overflow scroll gradient</span></a>
<a class="sidebar__link" href="#pretty-text-underline"><span>Pretty text underline</span></a>
<a class="sidebar__link" href="#reset-all-styles"><span>Reset all styles</span></a>
<a class="sidebar__link" href="#shape-separator"><span>Shape separator</span></a>
<a class="sidebar__link" href="#system-font-stack"><span>System font stack</span></a>
<a class="sidebar__link" href="#triangle"><span>Triangle</span></a>
</section>
<section data-type="animation" class="sidebar__section">
<h4 class="sidebar__section-heading">animation</h4>
<a class="sidebar__link" href="#bouncing-loader"><span>Bouncing loader</span></a>
<a class="sidebar__link" href="#donut-spinner"><span>Donut spinner</span></a>
<a class="sidebar__link" href="#easing-variables"><span>Easing variables</span></a>
<a class="sidebar__link" href="#hover-underline-animation"><span>Hover underline animation</span></a>
</section>
<section data-type="interactivity" class="sidebar__section">
<h4 class="sidebar__section-heading">interactivity</h4>
<a class="sidebar__link" href="#disable-selection"><span>Disable selection</span></a>
<a class="sidebar__link" href="#mouse-cursor-gradient-tracking"><span>Mouse cursor gradient tracking</span></a>
<a class="sidebar__link" href="#popout-menu"><span>Popout menu</span></a>
<a class="sidebar__link" href="#sibling-fade"><span>Sibling fade</span></a>
</section>
<section data-type="other" class="sidebar__section">
<h4 class="sidebar__section-heading">other</h4>
<a class="sidebar__link" href="#custom-variables"><span>Custom variables</span></a>
</section>
</div>
</nav>
<div class="content-wrapper">
<header class="header">
<div class="container">
<img class="header__logo" draggable="false" src="./src/img/logo.png">
<h1 class="header__heading">30 Seconds of <strong class="header__css">CSS</strong></h1>
<p class="header__description">
A curated collection of useful CSS snippets you can understand in 30 seconds or less.
</p>
<a class="github-button header__github-button" href="https://github.com/atomiks/30-seconds-of-css" data-icon="octicon-star" data-size="large" data-show-count="true" aria-label="Star atomiks/30-seconds-of-css on GitHub">Star</a>
</div>
</header>
<main class="main" id="main">
<div class="container">
<nav class="tags" aria-label="Filter by tags">
<button class="tags__tag is-large is-active" data-type="all">
<i data-feather="check"></i>all</button>
<button class="tags__tag is-large " data-type="layout">
<i data-feather="layout"></i>layout</button>
<button class="tags__tag is-large " data-type="visual">
<i data-feather="eye"></i>visual</button>
<button class="tags__tag is-large " data-type="animation">
<i data-feather="loader"></i>animation</button>
<button class="tags__tag is-large " data-type="interactivity">
<i data-feather="edit-2"></i>interactivity</button>
<button class="tags__tag is-large " data-type="other">
<i data-feather="tag"></i>other</button>
</nav>
<div class="snippet">
<h3 id="bouncing-loader"><span>Bouncing loader</span><span class="tags__tag snippet__tag" data-type="animation"><i data-feather="loader"></i>animation</span></h3>
<p>Creates a bouncing loader animation.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><div class="bouncing-loader">
<div></div>
<div></div>
<div></div>
</div>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">@keyframes bouncing-loader {
from {
opacity: 1;
transform: translateY(0);
}
to {
opacity: 0.1;
transform: translateY(-1rem);
}
}
.bouncing-loader {
display: flex;
justify-content: center;
}
.bouncing-loader > div {
width: 1rem;
height: 1rem;
margin: 3rem 0.2rem;
background: #8385aa;
border-radius: 50%;
animation: bouncing-loader 0.6s infinite alternate;
}
.bouncing-loader > div:nth-child(2) {
animation-delay: 0.2s;
}
.bouncing-loader > div:nth-child(3) {
animation-delay: 0.4s;
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<div class="snippet-demo__bouncing-loader">
<div></div>
<div></div>
<div></div>
</div>
</div>
<style>
@keyframes bouncing-loader {
from {
opacity: 1;
transform: translateY(0);
}
to {
opacity: 0.1;
transform: translateY(-1rem);
}
}
.snippet-demo__bouncing-loader {
display: flex;
justify-content: center;
}
.snippet-demo__bouncing-loader>div {
width: 1rem;
height: 1rem;
margin: 3rem 0.2rem;
background: #8385aa;
border-radius: 50%;
animation: bouncing-loader 0.6s infinite alternate;
}
.snippet-demo__bouncing-loader>div:nth-child(2) {
animation-delay: 0.2s;
}
.snippet-demo__bouncing-loader>div:nth-child(3) {
animation-delay: 0.4s;
}
</style>
<h4>Explanation</h4>
<p>Note: <code>1rem</code> is usually <code>16px</code>.</p>
<ol>
<li>
<p><code>@keyframes</code> defines an animation that has two states, where the element changes <code>opacity</code> and is translated up on the 2D plane using <code>transform: translateY()</code>.</p>
</li>
<li>
<p><code>.bouncing-loader</code> is the parent container of the bouncing circles and uses <code>display: flex</code> and <code>justify-content: center</code> to position them in the center.</p>
</li>
<li>
<p><code>.bouncing-loader > div</code>, targets the three child <code>div</code>s of the parent to be styled. The <code>div</code>s are given a width and height of <code>1rem</code>, using <code>border-radius: 50%</code> to turn them from
squares to circles.</p>
</li>
<li>
<p><code>margin: 3rem 0.2rem</code> specifies that each circle has a top/bottom margin of <code>3rem</code> and left/right margin of <code>0.2rem</code> so that they do not directly touch each other, giving them some breathing room.</p>
</li>
<li>
<p><code>animation</code> is a shorthand property for the various animation properties: <code>animation-name</code>, <code>animation-duration</code>, <code>animation-iteration-count</code>, <code>animation-direction</code> are used.</p>
</li>
<li>
<p><code>nth-child(n)</code> targets the element which is the nth child of its parent.</p>
</li>
<li>
<p><code>animation-delay</code> is used on the second and third <code>div</code> respectively, so that each element does not start the animation at the same time.</p>
</li>
</ol>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
95.3%
</div>
</div>
<p><span class="snippet__support-note">✅ No caveats.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=css-animation" target="_blank">https://caniuse.com/#feat=css-animation</a>
</li>
</ul>
<!-- tags: animation -->
</div>
<div class="snippet">
<h3 id="box-sizing-reset"><span>Box-sizing reset</span><span class="tags__tag snippet__tag" data-type="layout"><i data-feather="layout"></i>layout</span></h3>
<p>Resets the box-model so that <code>width</code>s and <code>height</code>s are not affected by their <code>border</code>s or <code>padding</code>.</p>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">html {
box-sizing: border-box;
}
*,
*::before,
*::after {
box-sizing: inherit;
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<div class="snippet-demo__box-sizing-reset">Demo</div>
</div>
<style>
.snippet-demo__box-sizing-reset {
box-sizing: border-box;
width: 200px;
padding: 1.5em;
color: #7983ff;
font-family: sans-serif;
background-color: white;
border: 5px solid;
}
</style>
<h4>Explanation</h4>
<ol>
<li><code>box-sizing: border-box</code> makes the addition of <code>padding</code> or <code>border</code>s not affect an element's <code>width</code> or <code>height</code>.</li>
<li><code>box-sizing: inherit</code> makes an element respect its parent's <code>box-sizing</code> rule.</li>
</ol>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
98.4%
</div>
</div>
<p><span class="snippet__support-note">✅ No caveats.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=css3-boxsizing" target="_blank">https://caniuse.com/#feat=css3-boxsizing</a>
</li>
</ul>
<!-- tags: layout -->
</div>
<div class="snippet">
<h3 id="circle"><span>Circle</span><span class="tags__tag snippet__tag" data-type="visual"><i data-feather="eye"></i>visual</span></h3>
<p>Creates a circle shape with pure CSS.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><div class="circle"></div>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">.circle {
border-radius: 50%;
width: 2rem;
height: 2rem;
background: #333;
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<div class="snippet-demo__circle"></div>
</div>
<style>
.snippet-demo__circle {
border-radius: 50%;
width: 2rem;
height: 2rem;
background: #333;
}
</style>
<h4>Explanation</h4>
<p><code>border-radius: 50%</code> curves the borders of an element to create a circle.</p>
<p>Since a circle has the same radius at any given point, the <code>width</code> and <code>height</code> must be the same. Differing values will create an ellipse.</p>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
95.5%
</div>
</div>
<p><span class="snippet__support-note">✅ No caveats.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=border-radius" target="_blank">https://caniuse.com/#feat=border-radius</a>
</li>
</ul>
<!-- tags: visual -->
</div>
<div class="snippet">
<h3 id="clearfix"><span>Clearfix</span><span class="tags__tag snippet__tag" data-type="layout"><i data-feather="layout"></i>layout</span></h3>
<p>Ensures that an element self-clears its children.</p>
<h6>Note: This is only useful if you are still using float to build layouts. Please consider using a modern approach with flexbox layout or grid layout.</h6>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><div class="clearfix">
<div class="floated">float a</div>
<div class="floated">float b</div>
<div class="floated">float c</div>
</div>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">.clearfix::after {
content: '';
display: block;
clear: both;
}
.floated {
float: left;
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<div class="snippet-demo__clearfix">
<div class="snippet-demo__floated">float a</div>
<div class="snippet-demo__floated">float b</div>
<div class="snippet-demo__floated">float c</div>
</div>
</div>
<style>
.snippet-demo__clearfix::after {
content: '';
display: block;
clear: both;
}
.snippet-demo__floated {
float: left;
}
</style>
<h4>Explanation</h4>
<ol>
<li><code>.clearfix::after</code> defines a pseudo-element.</li>
<li><code>content: ''</code> allows the pseudo-element to affect layout.</li>
<li><code>clear: both</code> indicates that the left, right or both sides of the element cannot be adjacent to earlier floated elements within the same block formatting context.</li>
</ol>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
99+%
</div>
</div>
<p><span class="snippet__support-note">⚠️ For this snippet to work properly you need to ensure that there are no non-floating children in the container and that there are no tall floats before the clearfixed container but in the same formatting context (e.g. floated columns).</span></p>
<!-- tags: layout -->
</div>
<div class="snippet">
<h3 id="constant-width-to-height-ratio"><span>Constant width to height ratio</span><span class="tags__tag snippet__tag" data-type="layout"><i data-feather="layout"></i>layout</span></h3>
<p>Given an element of variable width, it will ensure its height remains proportionate in a responsive fashion (i.e., its width to height ratio remains constant).</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><div class="constant-width-to-height-ratio"></div>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">.constant-width-to-height-ratio {
background: #333;
width: 50%;
}
.constant-width-to-height-ratio::before {
content: '';
display: block;
padding-top: 100%;
float: left;
}
.constant-width-to-height-ratio::after {
content: '';
display: block;
clear: both;
}
</code></pre>
<h4>Demo</h4>
<p>Resize your browser window to see the proportion of the element remain the same.</p>
<div class="snippet-demo">
<div class="snippet-demo__constant-width-to-height-ratio"></div>
</div>
<style>
.snippet-demo__constant-width-to-height-ratio {
background: #333;
width: 50%;
}
.snippet-demo__constant-width-to-height-ratio::before {
content: '';
display: block;
padding-top: 100%;
float: left;
}
.snippet-demo__constant-width-to-height-ratio::after {
content: '';
display: block;
clear: both;
}
</style>
<h4>Explanation</h4>
<p><code>padding-top</code> on the <code>::before</code> pseudo-element causes the height of the element to equal a percentage of its width. <code>100%</code> therefore means the element's height will always be <code>100%</code> of the width,
creating a responsive square.
</p>
<p>This method also allows content to be placed inside the element normally.</p>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
99+%
</div>
</div>
<p><span class="snippet__support-note">✅ No caveats.</span></p>
<!-- tags: layout -->
</div>
<div class="snippet">
<h3 id="custom-scrollbar"><span>Custom scrollbar</span><span class="tags__tag snippet__tag" data-type="visual"><i data-feather="eye"></i>visual</span></h3>
<p>Customizes the scrollbar style for the document and elements with scrollable overflow, on WebKit platforms.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><div class="custom-scrollbar">
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Iure id exercitationem nulla qui repellat laborum vitae, molestias tempora velit natus. Quas, assumenda nisi. Quisquam enim qui iure, consequatur velit sit?</p>
</div>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">/* Document scrollbar */
::-webkit-scrollbar {
width: 8px;
}
::-webkit-scrollbar-track {
box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
border-radius: 10px;
}
::-webkit-scrollbar-thumb {
border-radius: 10px;
box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.5);
}
/* Scrollable element */
.some-element::webkit-scrollbar {
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<div class="snippet-demo__custom-scrollbar">
<p>
Lorem ipsum dolor sit amet consectetur adipisicing elit. Iure id exercitationem nulla qui repellat laborum vitae, molestias tempora velit natus. Quas, assumenda nisi. Quisquam enim qui iure, consequatur velit sit?
</p>
<p>
Lorem ipsum dolor sit amet consectetur adipisicing elit. Iure id exercitationem nulla qui repellat laborum vitae, molestias tempora velit natus. Quas, assumenda nisi. Quisquam enim qui iure, consequatur velit sit?
</p>
</div>
</div>
<style>
.snippet-demo__custom-scrollbar {
height: 100px;
overflow: auto;
}
.snippet-demo__custom-scrollbar::-webkit-scrollbar {
width: 8px;
}
.snippet-demo__custom-scrollbar::-webkit-scrollbar-track {
box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
border-radius: 10px;
}
.snippet-demo__custom-scrollbar::-webkit-scrollbar-thumb {
border-radius: 10px;
box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.5);
}
</style>
<h4>Explanation</h4>
<ol>
<li><code>::-webkit-scrollbar</code> targets the whole scrollbar element.</li>
<li><code>::-webkit-scrollbar-track</code> targets only the scrollbar track.</li>
<li><code>::-webkit-scrollbar-thumb</code> targets the scrollbar thumb.</li>
</ol>
<p>There are many other pseudo-elements that you can use to style scrollbars. For more info, visit the
<a href="https://webkit.org/blog/363/styling-scrollbars/" target="_blank">WebKit Blog</a>
</p>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
88.0%
</div>
</div>
<p><span class="snippet__support-note">⚠️ Scrollbar styling doesn't appear to be on any standards track.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=css-scrollbar" target="_blank">https://caniuse.com/#feat=css-scrollbar</a>
</li>
</ul>
<!-- tags: visual -->
</div>
<div class="snippet">
<h3 id="custom-text-selection"><span>Custom text selection</span><span class="tags__tag snippet__tag" data-type="visual"><i data-feather="eye"></i>visual</span></h3>
<p>Changes the styling of text selection.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><p class="custom-text-selection">Select some of this text.</p>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">::selection {
background: aquamarine;
color: black;
}
.custom-text-selection::selection {
background: deeppink;
color: white;
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<p class="snippet-demo__custom-text-selection">Select some of this text.</p>
</div>
<style>
.snippet-demo__custom-text-selection::selection {
background: deeppink;
color: white;
}
.snippet-demo__custom-text-selection::-moz-selection {
background: deeppink;
color: white;
}
</style>
<h4>Explanation</h4>
<p><code>::selection</code> defines a pseudo selector on an element to style text within it when selected. Note that if you don't combine any other selector your style will be applied at document root level, to any selectable element.</p>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
84.9%
</div>
</div>
<p><span class="snippet__support-note">⚠️ Requires prefixes for full support and is not actually
in any specification.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=css-selection" target="_blank">https://caniuse.com/#feat=css-selection</a>
</li>
</ul>
<!-- tags: visual -->
</div>
<div class="snippet">
<h3 id="custom-variables"><span>Custom variables</span><span class="tags__tag snippet__tag" data-type="other"><i data-feather="tag"></i>other</span></h3>
<p>CSS variables that contain specific values to be reused throughout a document.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><p class="custom-variables">CSS is awesome!</p>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">:root {
--some-color: #da7800;
--some-keyword: italic;
--some-size: 1.25em;
--some-complex-value: 1px 1px 2px whitesmoke, 0 0 1em slategray, 0 0 0.2em slategray;
}
.custom-variables {
color: var(--some-color);
font-size: var(--some-size);
font-style: var(--some-keyword);
text-shadow: var(--some-complex-value);
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<div class="snippet-demo__custom-variables">
<p>CSS is awesome!</p>
</div>
</div>
<style>
.snippet-demo__custom-variables {
--some-color: #686868;
--some-keyword: italic;
--some-size: 1.25em;
--some-complex-value: 1px 1px 2px whitesmoke, 0 0 1em slategray, 0 0 0.2em slategray;
}
.snippet-demo__custom-variables p {
color: var(--some-color);
font-size: var(--some-size);
font-style: var(--some-keyword);
text-shadow: var(--some-complex-value);
}
</style>
<h4>Explanation</h4>
<p>The variables are defined globally within the <code>:root</code> CSS pseudo-class which matches the root element of a tree representing the document. Variables can also be scoped to a selector if defined within the block.</p>
<p>Declare a variable with <code>--variable-name:</code>.</p>
<p>Reuse variables throughout the document using the <code>var(--variable-name)</code> function.</p>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
88.0%
</div>
</div>
<p><span class="snippet__support-note">✅ No caveats.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=css-variables" target="_blank">https://caniuse.com/#feat=css-variables</a>
</li>
</ul>
<!-- tags: other -->
</div>
<div class="snippet">
<h3 id="disable-selection"><span>Disable selection</span><span class="tags__tag snippet__tag" data-type="interactivity"><i data-feather="edit-2"></i>interactivity</span></h3>
<p>Makes the content unselectable.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><p>You can select me.</p>
<p class="unselectable">You can't select me!</p>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">.unselectable {
user-select: none;
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<p>You can select me.</p>
<p class="snippet-demo__disable-selection">You can't select me!</p>
</div>
<style>
.snippet-demo__disable-selection {
user-select: none;
}
</style>
<h4>Explanation</h4>
<p><code>user-select: none</code> specifies that the text cannot be selected.</p>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
87.2%
</div>
</div>
<p><span class="snippet__support-note">⚠️ Requires prefixes for full support.</span>
<span class="snippet__support-note">⚠️ This is not a secure method to prevent users from copying content.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=user-select-none" target="_blank">https://caniuse.com/#feat=user-select-none</a>
</li>
</ul>
<!-- tags: interactivity -->
</div>
<div class="snippet">
<h3 id="donut-spinner"><span>Donut spinner</span><span class="tags__tag snippet__tag" data-type="animation"><i data-feather="loader"></i>animation</span></h3>
<p>Creates a donut spinner that can be used to indicate the loading of content.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><div class="donut"></div>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">@keyframes donut-spin {
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(360deg);
}
}
.donut {
display: inline-block;
border: 4px solid rgba(0, 0, 0, 0.1);
border-left-color: #7983ff;
border-radius: 50%;
width: 30px;
height: 30px;
animation: donut-spin 1.2s linear infinite;
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<div class="snippet-demo__donut-spinner"></div>
</div>
<style>
@keyframes snippet-demo__donut-spin {
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(360deg);
}
}
.snippet-demo__donut-spinner {
display: inline-block;
border: 4px solid rgba(0, 0, 0, 0.1);
border-left-color: #7983ff;
border-radius: 50%;
width: 30px;
height: 30px;
animation: snippet-demo__donut-spin 1.2s linear infinite;
}
</style>
<h4>Explanation</h4>
<p>Use a semi-transparent <code>border</code> for the whole element, except one side that will serve as the loading indicator for the donut. Use <code>animation</code> to rotate the element.</p>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
95.3%
</div>
</div>
<p><span class="snippet__support-note">⚠️ Requires prefixes for full support.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=css-animation" target="_blank">https://caniuse.com/#feat=css-animation</a>
</li>
<li>
<a href="https://caniuse.com/#feat=transforms2d" target="_blank">https://caniuse.com/#feat=transforms2d</a>
</li>
</ul>
<!-- tags: animation -->
</div>
<div class="snippet">
<h3 id="dynamic-shadow"><span>Dynamic shadow</span><span class="tags__tag snippet__tag" data-type="visual"><i data-feather="eye"></i>visual</span></h3>
<p>Creates a shadow similar to <code>box-shadow</code> but based on the colors of the element itself.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><div class="dynamic-shadow-parent">
<div class="dynamic-shadow"></div>
</div>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">.dynamic-shadow-parent {
position: relative;
z-index: 1;
}
.dynamic-shadow {
position: relative;
width: 10rem;
height: 10rem;
background: linear-gradient(75deg, #6d78ff, #00ffb8);
}
.dynamic-shadow::after {
content: '';
width: 100%;
height: 100%;
position: absolute;
background: inherit;
top: 0.5rem;
filter: blur(0.4rem);
opacity: 0.7;
z-index: -1;
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<div class="snippet-demo__dynamic-shadow-parent">
<div class="snippet-demo__dynamic-shadow"></div>
</div>
</div>
<style>
.snippet-demo__dynamic-shadow-parent {
position: relative;
z-index: 1;
}
.snippet-demo__dynamic-shadow {
position: relative;
width: 10rem;
height: 10rem;
background: linear-gradient(75deg, #6d78ff, #00ffb8);
}
.snippet-demo__dynamic-shadow::after {
content: '';
position: absolute;
width: 100%;
height: 100%;
background: inherit;
top: 0.5rem;
filter: blur(0.4rem);
opacity: 0.7;
z-index: -1;
}
</style>
<h4>Explanation</h4>
<p>The snippet requires a somewhat complex case of stacking contexts to get right, such that the pseudo-element will be positioned underneath the element itself while still being visible.</p>
<ol>
<li><code>position: relative</code> on the parent establishes a Cartesian positioning context for child elements.</li>
<li><code>z-index: 1</code> establishes a new stacking context.</li>
<li><code>position: relative</code> on the child establishes a positioning context for pseudo-elements.</li>
<li><code>::after</code> defines a pseudo-element.</li>
<li><code>position: absolute</code> takes the pseudo element out of the flow of the document and positions it in relation to the parent.</li>
<li><code>width: 100%</code> and <code>height: 100%</code> sizes the pseudo-element to fill its parent's dimensions, making it equal in size.</li>
<li><code>background: inherit</code> causes the pseudo-element to inherit the linear gradient specified on the element.</li>
<li><code>top: 0.5rem</code> offsets the pseudo-element down slightly from its parent.</li>
<li><code>filter: blur(0.4rem)</code> will blur the pseudo-element to create the appearance of a shadow underneath.</li>
<li><code>opacity: 0.7</code> makes the pseudo-element partially transparent.</li>
<li><code>z-index: -1</code> positions the pseudo-element behind the parent.</li>
</ol>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
91.7%
</div>
</div>
<p><span class="snippet__support-note">⚠️ Requires prefixes for full support.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=css-filters" target="_blank">https://caniuse.com/#feat=css-filters</a>
</li>
</ul>
<!-- tags: visual -->
</div>
<div class="snippet">
<h3 id="easing-variables"><span>Easing variables</span><span class="tags__tag snippet__tag" data-type="animation"><i data-feather="loader"></i>animation</span></h3>
<p>Variables that can be reused for <code>transition-timing-function</code> properties, more powerful than the built-in <code>ease</code>, <code>ease-in</code>, <code>ease-out</code> and <code>ease-in-out</code>.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><div class="easing-variables"></div>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">:root {
--ease-in-quad: cubic-bezier(0.55, 0.085, 0.68, 0.53);
--ease-in-cubic: cubic-bezier(0.55, 0.055, 0.675, 0.19);
--ease-in-quart: cubic-bezier(0.895, 0.03, 0.685, 0.22);
--ease-in-quint: cubic-bezier(0.755, 0.05, 0.855, 0.06);
--ease-in-expo: cubic-bezier(0.95, 0.05, 0.795, 0.035);
--ease-in-circ: cubic-bezier(0.6, 0.04, 0.98, 0.335);
--ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
--ease-out-cubic: cubic-bezier(0.215, 0.61, 0.355, 1);
--ease-out-quart: cubic-bezier(0.165, 0.84, 0.44, 1);
--ease-out-quint: cubic-bezier(0.23, 1, 0.32, 1);
--ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
--ease-out-circ: cubic-bezier(0.075, 0.82, 0.165, 1);
--ease-in-out-quad: cubic-bezier(0.455, 0.03, 0.515, 0.955);
--ease-in-out-cubic: cubic-bezier(0.645, 0.045, 0.355, 1);
--ease-in-out-quart: cubic-bezier(0.77, 0, 0.175, 1);
--ease-in-out-quint: cubic-bezier(0.86, 0, 0.07, 1);
--ease-in-out-expo: cubic-bezier(1, 0, 0, 1);
--ease-in-out-circ: cubic-bezier(0.785, 0.135, 0.15, 0.86);
}
.easing-variables {
width: 50px;
height: 50px;
background: #333;
transition: transform 1s var(--ease-out-quart);
}
.easing-variables:hover {
transform: rotate(45deg);
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<div class="snippet-demo__easing-variables">Hover</div>
</div>
<style>
:root {
--ease-in-quad: cubic-bezier(0.55, 0.085, 0.68, 0.53);
--ease-in-cubic: cubic-bezier(0.55, 0.055, 0.675, 0.19);
--ease-in-quart: cubic-bezier(0.895, 0.03, 0.685, 0.22);
--ease-in-quint: cubic-bezier(0.755, 0.05, 0.855, 0.06);
--ease-in-expo: cubic-bezier(0.95, 0.05, 0.795, 0.035);
--ease-in-circ: cubic-bezier(0.6, 0.04, 0.98, 0.335);
--ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
--ease-out-cubic: cubic-bezier(0.215, 0.61, 0.355, 1);
--ease-out-quart: cubic-bezier(0.165, 0.84, 0.44, 1);
--ease-out-quint: cubic-bezier(0.23, 1, 0.32, 1);
--ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
--ease-out-circ: cubic-bezier(0.075, 0.82, 0.165, 1);
--ease-in-out-quad: cubic-bezier(0.455, 0.03, 0.515, 0.955);
--ease-in-out-cubic: cubic-bezier(0.645, 0.045, 0.355, 1);
--ease-in-out-quart: cubic-bezier(0.77, 0, 0.175, 1);
--ease-in-out-quint: cubic-bezier(0.86, 0, 0.07, 1);
--ease-in-out-expo: cubic-bezier(1, 0, 0, 1);
--ease-in-out-circ: cubic-bezier(0.785, 0.135, 0.15, 0.86);
}
.snippet-demo__easing-variables {
width: 75px;
height: 75px;
background: #333;
color: white;
font-size: 0.8rem;
font-weight: bold;
display: flex;
justify-content: center;
align-items: center;
transition: transform 1s var(--ease-out-quart);
}
.snippet-demo__easing-variables:hover {
transform: rotate(45deg);
}
</style>
<h4>Explanation</h4>
<p>The variables are defined globally within the <code>:root</code> CSS pseudo-class which matches the root element of a tree representing the document. In HTML, <code>:root</code> represents the <code><html></code> element and is identical
to the selector <code>html</code>, except that its specificity is higher.</p>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
88.0%
</div>
</div>
<p><span class="snippet__support-note">✅ No caveats.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=css-variables" target="_blank">https://caniuse.com/#feat=css-variables</a>
</li>
</ul>
<!-- tags: animation -->
</div>
<div class="snippet">
<h3 id="etched-text"><span>Etched text</span><span class="tags__tag snippet__tag" data-type="visual"><i data-feather="eye"></i>visual</span></h3>
<p>Creates an effect where text appears to be "etched" or engraved into the background.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><p class="etched-text">I appear etched into the background.</p>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">.etched-text {
text-shadow: 0 2px white;
font-size: 1.5rem;
font-weight: bold;
color: #b8bec5;
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<p class="snippet-demo__etched-text">I appear etched into the background.</p>
</div>
<style>
.snippet-demo__etched-text {
font-size: 1.5rem;
font-weight: bold;
color: #b8bec5;
text-shadow: 0 2px 0 white;
}
</style>
<h4>Explanation</h4>
<p><code>text-shadow: 0 2px white</code> creates a white shadow offset <code>0px</code> horizontally and <code>2px</code> vertically from the origin position.</p>
<p>The background must be darker than the shadow for the effect to work.</p>
<p>The text color should be slightly faded to make it look like it's engraved/carved out of the background.</p>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
98.1%
</div>
</div>
<p><span class="snippet__support-note">✅ No caveats.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=css-textshadow" target="_blank">https://caniuse.com/#feat=css-textshadow</a>
</li>
</ul>
<!-- tags: visual -->
</div>
<div class="snippet">
<h3 id="evenly-distributed-children"><span>Evenly distributed children</span><span class="tags__tag snippet__tag" data-type="layout"><i data-feather="layout"></i>layout</span></h3>
<p>Evenly distributes child elements within a parent element.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><div class="evenly-distributed-children">
<p>Item1</p>
<p>Item2</p>
<p>Item3</p>
</div>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">.evenly-distributed-children {
display: flex;
justify-content: space-between;
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<div class="snippet-demo__evenly-distributed-children">
<p>Item1</p>
<p>Item2</p>
<p>Item3</p>
</div>
</div>
<style>
.snippet-demo__evenly-distributed-children {
display: flex;
width: 100%;
justify-content: space-between;
}
</style>
<h4>Explanation</h4>
<ol>
<li><code>display: flex</code> enables flexbox.</li>
<li><code>justify-content: space-between</code> evenly distributes child elements horizontally. The first item is positioned at the left edge, while the last item is positioned at the right edge.</li>
</ol>
<p>Alternatively, use <code>justify-content: space-around</code> to distribute the children with space around them, rather than between them.</p>
<h4>Browser support</h4>
<div>
<div class="snippet__browser-support">
98.1%
</div>
</div>
<p><span class="snippet__support-note">⚠️ Needs prefixes for full support.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=flexbox" target="_blank">https://caniuse.com/#feat=flexbox</a>
</li>
</ul>
<!-- tags: layout -->
</div>
<div class="snippet">
<h3 id="flexbox-centering"><span>Flexbox centering</span><span class="tags__tag snippet__tag" data-type="layout"><i data-feather="layout"></i>layout</span></h3>
<p>Horizontally and vertically centers a child element within a parent element using <code>flexbox</code>.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html"><div class="flexbox-centering">
<div class="child">Centered content.</div>
</div>
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">.flexbox-centering {
display: flex;
justify-content: center;
align-items: center;
}
</code></pre>
<h4>Demo</h4>
<div class="snippet-demo">
<div class="snippet-demo__flexbox-centering">
<p class="snippet-demo__flexbox-centering__child">Centered content.</p>
</div>
</div>
<style>
.snippet-demo__flexbox-centering {
display: flex;
justify-content: center;
align-items: center;
height: 200px;
}
</style>
<h4>Explanation</h4>
<ol>
<li><code>display: flex</code> enables flexbox.</li>