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# 30 Seconds of CSS
![logo](https://i.imgur.com/2L1bMyy.png)
A curated collection of useful CSS snippets you can understand in 30 seconds or less.
Inspired by [30 seconds of code](https://github.com/Chalarangelo/30-seconds-of-code).

6
docs/4d4edbda57043aeeabeac31d2dd12d0d.js
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
@ -8,9 +10,9 @@
<script async="" defer="" src="https://buttons.github.io/buttons.js"></script>
</head>
<body>
<button class="back-to-top-button">↑</button>
<aside class="sidebar">
<button class="hamburger hamburger--spin sidebar__menu" type="button">
<button class="back-to-top-button" aria-label="back to top">↑</button>
<nav class="sidebar" aria-label="Table of Contents">
<button class="hamburger hamburger--spin sidebar__menu" type="button" aria-label="Menu">
<span class="hamburger-box">
<span class="hamburger-inner"></span>
</span>
@ -34,7 +36,7 @@
<a class="sidebar__link" href="#triangle">Triangle</a>
<a class="sidebar__link" href="#truncate-text">Truncate text</a>
</div>
</aside>
</nav>
<div class="content-wrapper">
<header class="header">
<div class="container">
@ -43,12 +45,10 @@
<p class="header__description">
A curated collection of useful CSS snippets you can understand in 30 seconds or less.
</p>
<!-- Place this tag where you want the button to render. -->
<a class="github-button header__github-button" href="https://github.com/atomiks/30-seconds-of-css" data-icon="octicon-star" data-size="large" aria-label="Star atomiks/30-seconds-of-css on GitHub">Star</a>
<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">
<main class="main" id="main">
<div class="container">
<div class="snippet">
<h3 id="clearfix">Clearfix</h3>
@ -125,8 +125,8 @@
}
</style>
<h4 data-type="Explanation">Explanation</h4>
<p><code>padding-top</code> and <code>padding-bottom</code> can be used as an alternative to <code>height</code> such that the percentage value causes an element's height to become a percentage of its width, i.e. <code>50%</code> means the height
will be 50% of the element's width. This allows its proportion to remain constant.</p>
<p><code>padding-top</code> and <code>padding-bottom</code> can be used as an alternative to <code>height</code> such that the percentage value causes an element's height to become a percentage of its parent's width, i.e. <code>50%</code> means
the height will be 50% of the parent element's width, which means it acts the same as <code>width</code>. This allows its proportion to remain constant.</p>
<h4 data-type="Browser support">Browser support</h4>
<div>
<div class="snippet__browser-support">
@ -666,6 +666,7 @@ var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
width: 300px;
height: 25px;
background: linear-gradient(rgba(255, 255, 255, 0.001), white); /* transparent keyword is broken in Safari */
pointer-events: none;
}
.overflow-scroll-gradient__scroller {
overflow-y: scroll;
@ -696,6 +697,7 @@ var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
width: 300px;
height: 25px;
bottom: 0;
pointer-events: none;
}
.snippet-demo__overflow-scroll-gradient__scroller {
overflow-y: scroll;
@ -712,13 +714,14 @@ var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
</script>
<h4 data-type="Explanation">Explanation</h4>
<ol>
<li><code>position: relative</code> on the parent establishes a Cartesian positioning context for psuedo elements.</li>
<li><code>position: relative</code> on the parent establishes a Cartesian positioning context for psuedo-elements.</li>
<li><code>::after</code> defines a pseudo element.</li>
<li><code>background-image: linear-gradient(...)</code> adds a linear gradient that fades from transparent to white (top to bottom).</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: 300px</code> matches the size of the scrolling element (which is a child of the parent that has the pseudo element).</li>
<li><code>height: 25px</code> is the height of the fading gradient psuedo element, which should be kept relatively small.</li>
<li><code>bottom: 0</code> positions the pseudo element at the bottom of the parent.</li>
<li><code>height: 25px</code> is the height of the fading gradient psuedo-element, which should be kept relatively small.</li>
<li><code>bottom: 0</code> positions the pseudo-element at the bottom of the parent.</li>
<li><code>pointer-events: none</code> specifies that the psuedo-element cannot be a target of mouse events, allowing text behind it to still be selectable/interactive.</li>
</ol>
<h4 data-type="Browser support">Browser support</h4>
<div>
@ -809,16 +812,20 @@ var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">.pretty-text-underline {
display: inline;
font-size: 1.25rem;
font-size: 18px;
text-shadow: 1px 1px 0 #f5f6f9,
-1px 1px 0 #f5f6f9,
-1px -1px 0 #f5f6f9,
1px -1px 0 #f5f6f9;
background-image: linear-gradient(90deg, currentColor 100%, transparent 100%);
background-position: 0 1.04em;
background-position: 0 18px;
background-repeat: repeat-x;
background-size: 1px 1px;
}
.pretty-text-underline::-moz-selection {
background-color: rgba(0, 150, 255, 0.3);
text-shadow: none;
}
.pretty-text-underline::selection {
background-color: rgba(0, 150, 255, 0.3);
text-shadow: none;
@ -834,10 +841,14 @@ var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
font-size: 18px !important;
text-shadow: 1px 1px 0 #f5f6f9, -1px 1px 0 #f5f6f9, -1px -1px 0 #f5f6f9, 1px -1px 0 #f5f6f9;
background-image: linear-gradient(90deg, currentColor 100%, transparent 100%);
background-position: 0 1.04em;
background-position: 0 18px;
background-repeat: repeat-x;
background-size: 1px 1px;
}
.snippet-demo__pretty-text-underline::-moz-selection {
background-color: rgba(0, 150, 255, 0.3);
text-shadow: none;
}
.snippet-demo__pretty-text-underline::selection {
background-color: rgba(0, 150, 255, 0.3);
text-shadow: none;
@ -858,7 +869,7 @@ var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
94.8%
</div>
</div>
<p><span class="snippet__support-note">✅ No caveats.</span></p>
<p><span class="snippet__support-note">⚠️ Firefox requires a vendor prefix for the selection pseudo-selector to work.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=css-textshadow" target="_blank">https://caniuse.com/#feat=css-textshadow</a>
@ -1044,7 +1055,7 @@ var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
</div>
<div class="snippet">
<h3 id="truncate-text">Truncate text</h3>
<p>If the text is longer than one line, it will be truncated and end with an ellipsis <code>...</code>.</p>
<p>If the text is longer than one line, it will be truncated and end with an ellipsis <code>…</code>.</p>
<h4 data-type="HTML">HTML</h4><pre><code class="lang-html">&lt;p class="truncate-text"&gt;If I exceed one line's width, I will be truncated.&lt;/p&gt;
</code></pre>
<h4 data-type="CSS">CSS</h4><pre><code class="lang-css">.truncate-text {
@ -1080,7 +1091,7 @@ var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
98.1%
</div>
</div>
<p><span class="snippet__support-note">✅ No caveats.</span></p>
<p><span class="snippet__support-note">⚠️ Only works for single line elements.</span></p>
<ul>
<li>
<a href="https://caniuse.com/#feat=text-overflow" target="_blank">https://caniuse.com/#feat=text-overflow</a>
@ -1092,4 +1103,4 @@ var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
</div>
<footer class="footer"></footer>
</body>
</html>
</html>

8
scripts/build.js
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@ -67,4 +67,10 @@ for (const snippetFile of fs.readdirSync(SNIPPETS_PATH)) {
)
}
fs.writeFileSync('./index.html', pretty(document.documentElement.outerHTML, { ocd: true }))
// doctype declaration gets stripped, add it back in
const html = `
<!DOCTYPE html>
${pretty(document.documentElement.outerHTML, { ocd: true })}
`
fs.writeFileSync('./index.html', html)

2
snippets/constant-width-to-height-ratio.md
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@ -38,7 +38,7 @@ Resize your browser window to see the proportion of the element remain the same.
#### Explanation
`padding-top` and `padding-bottom` can be used as an alternative to `height` such that the percentage value
causes an element's height to become a percentage of its width, i.e. `50%` means the height will be 50% of the element's width. This allows its proportion to remain constant.
causes an element's height to become a percentage of its parent's width, i.e. `50%` means the height will be 50% of the parent element's width, which means it acts the same as `width`. This allows its proportion to remain constant.
#### Browser support

9
snippets/overflow-scroll-gradient.md
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@ -25,6 +25,7 @@ Adds a fading gradient to an overflowing element to better indicate there is mor
width: 300px;
height: 25px;
background: linear-gradient(rgba(255, 255, 255, 0.001), white); /* transparent keyword is broken in Safari */
pointer-events: none;
}
.overflow-scroll-gradient__scroller {
overflow-y: scroll;
@ -58,6 +59,7 @@ Adds a fading gradient to an overflowing element to better indicate there is mor
width: 300px;
height: 25px;
bottom: 0;
pointer-events: none;
}
.snippet-demo__overflow-scroll-gradient__scroller {
overflow-y: scroll;
@ -76,15 +78,16 @@ document.querySelector('.snippet-demo__overflow-scroll-gradient__scroller').inne
#### Explanation
1. `position: relative` on the parent establishes a Cartesian positioning context for psuedo elements.
1. `position: relative` on the parent establishes a Cartesian positioning context for psuedo-elements.
2. `::after` defines a pseudo element.
3. `background-image: linear-gradient(...)` adds a linear gradient that fades from transparent to white
(top to bottom).
4. `position: absolute` takes the pseudo element out of the flow of the document and positions it in relation to the parent.
5. `width: 300px` matches the size of the scrolling element (which is a child of the parent that has
the pseudo element).
6. `height: 25px` is the height of the fading gradient psuedo element, which should be kept relatively small.
7. `bottom: 0` positions the pseudo element at the bottom of the parent.
6. `height: 25px` is the height of the fading gradient psuedo-element, which should be kept relatively small.
7. `bottom: 0` positions the pseudo-element at the bottom of the parent.
8. `pointer-events: none` specifies that the psuedo-element cannot be a target of mouse events, allowing text behind it to still be selectable/interactive.
#### Browser support

17
snippets/pretty-text-underline.md
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@ -14,16 +14,20 @@ Natively implemented as `text-decoration-skip-ink: auto` but it has less control
```css
.pretty-text-underline {
display: inline;
font-size: 1.25rem;
font-size: 18px;
text-shadow: 1px 1px 0 #f5f6f9,
-1px 1px 0 #f5f6f9,
-1px -1px 0 #f5f6f9,
1px -1px 0 #f5f6f9;
background-image: linear-gradient(90deg, currentColor 100%, transparent 100%);
background-position: 0 1.04em;
background-position: 0 18px;
background-repeat: repeat-x;
background-size: 1px 1px;
}
.pretty-text-underline::-moz-selection {
background-color: rgba(0, 150, 255, 0.3);
text-shadow: none;
}
.pretty-text-underline::selection {
background-color: rgba(0, 150, 255, 0.3);
text-shadow: none;
@ -45,11 +49,16 @@ Natively implemented as `text-decoration-skip-ink: auto` but it has less control
-1px -1px 0 #f5f6f9,
1px -1px 0 #f5f6f9;
background-image: linear-gradient(90deg, currentColor 100%, transparent 100%);
background-position: 0 1.04em;
background-position: 0 18px;
background-repeat: repeat-x;
background-size: 1px 1px;
}
.snippet-demo__pretty-text-underline::-moz-selection {
background-color: rgba(0, 150, 255, 0.3);
text-shadow: none;
}
.snippet-demo__pretty-text-underline::selection {
background-color: rgba(0, 150, 255, 0.3);
text-shadow: none;
@ -69,7 +78,7 @@ Natively implemented as `text-decoration-skip-ink: auto` but it has less control
#### Browser support
<span class="snippet__support-note">✅ No caveats.</span>
<span class="snippet__support-note">⚠️ Firefox requires a vendor prefix for the selection pseudo-selector to work.</span>
* https://caniuse.com/#feat=css-textshadow
* https://caniuse.com/#feat=css-gradients

4
snippets/truncate-text.md
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@ -1,6 +1,6 @@
### Truncate text
If the text is longer than one line, it will be truncated and end with an ellipsis `...`.
If the text is longer than one line, it will be truncated and end with an ellipsis `…`.
#### HTML
@ -46,6 +46,6 @@ If the text is longer than one line, it will be truncated and end with an ellips
#### Browser support
<span class="snippet__support-note">✅ No caveats.</span>
<span class="snippet__support-note">⚠️ Only works for single line elements.</span>
* https://caniuse.com/#feat=text-overflow