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30 Seconds of CSS

A curated collection of useful CSS snippets you can understand in 30 seconds or less.

Star

Bouncing loaderanimation

Creates a bouncing loader animation.

HTML

<div class="bouncing-loader">
+     30 Seconds of CSS         
 
 
  
30 Seconds of CSS
 
 A curated collection of useful CSS snippets you can understand in 30 seconds or less. 
 Star 
 
 
 
  
 
Bouncing loaderanimation
 
Creates a bouncing loader animation.
 
HTML
<div class="bouncing-loader">
   <div></div>
   <div></div>
   <div></div>
@@ -31,7 +31,7 @@
 .bouncing-loader > div:nth-of-type(3) {
   animation-delay: 0.4s;
 }
-
 
Demo
 
 
 
 
 
 
 
  
Explanation
 
Note: 1rem is usually 16px.
 
     
  1.  
    @keyframes defines an animation that has two states, where the element changes opacity, and is translated up on the 2D plane using transform: translateY().
     
    2.  
  2.  
    .bouncing-loader is the parent container of the bouncing circles and uses display: flex and justify-content: center to position them in the in the center.
     
    3.  
  3.  
    Using .bouncing-loader > div, we target the three child divs of the parent to be styled. The divs are given a width and height of 1rem, using border-radius: 50% to turn them from squares to circles.
     
    4.  
  4.  
    margin: 3rem 0.2rem specifies that each circle has a top/bottom margin of 3rem and left/right margin of 0.2rem so that they do not directly touch each other, giving them some breathing room.
     
    5.  
  5.  
    animation is a shorthand property for the various animation properties: animation-name, animation-duration, animation-iteration-count, animation-direction are used.
     
    6.  
  6.  
    animation-delay is used on the second and third div respectively, so that each element does not start the animation at the same time.
     
    7.  
 
Browser support
 
 
 95.3% 
 
 
✅ No caveats.
   
 
 
Box-sizing resetlayout
 
Resets the box-model so that widths and heights are not affected by their borders or padding.
 
CSS
html {
+
 
Demo
 
 
 
 
 
 
 
  
Explanation
 
Note: 1rem is usually 16px.
 
     
  1.  
    @keyframes defines an animation that has two states, where the element changes opacity, and is translated up on the 2D plane using transform: translateY().
     
    2.  
  2.  
    .bouncing-loader is the parent container of the bouncing circles and uses display: flex and justify-content: center to position them in the in the center.
     
    3.  
  3.  
    Using .bouncing-loader > div, we target the three child divs of the parent to be styled. The divs are given a width and height of 1rem, using border-radius: 50% to turn them from squares to circles.
     
    4.  
  4.  
    margin: 3rem 0.2rem specifies that each circle has a top/bottom margin of 3rem and left/right margin of 0.2rem so that they do not directly touch each other, giving them some breathing room.
     
    5.  
  5.  
    animation is a shorthand property for the various animation properties: animation-name, animation-duration, animation-iteration-count, animation-direction are used.
     
    6.  
  6.  
    animation-delay is used on the second and third div respectively, so that each element does not start the animation at the same time.
     
    7.  
 
Browser support
 
 
 95.3% 
 
 
✅ No caveats.
   
 
 
Box-sizing resetlayout
 
Resets the box-model so that widths and heights are not affected by their borders or padding.
 
CSS
html {
   box-sizing: border-box;
 }
 *,
@@ -92,7 +92,20 @@
   background: deeppink;
   color: white;
 }
-
 
Demo
 
 
Select some of this text.
 
  
Explanation
 
::selection 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.
 
Browser support
 
 
 84.9% 
 
 
⚠️ Requires prefixes for full support and is not actually in any specification.
   
 
 
Disable selectioninteractivity
 
Makes the content unselectable.
 
HTML
<p>You can select me.</p>
+
 
Demo
 
 
Select some of this text.
 
  
Explanation
 
::selection 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.
 
Browser support
 
 
 84.9% 
 
 
⚠️ Requires prefixes for full support and is not actually in any specification.
   
 
 
Custom variablesother
 
CSS variables that contain specific values to be reused throughout a document.
 
HTML
<p class="custom-variables">CSS is awesome!</p>
+
 
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);
+}
+
 
Demo
 
 
 
CSS is awesome!
 
 
  
Explanation
 
The variables are defined globally within the :root 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.
 
Declare a variable with --variable-name:.
 
Reuse variables throughout the document using the var(--variable-name) function.
 
Browser support
 
 
 88.0% 
 
 
✅ No caveats.
   
 
 
Disable selectioninteractivity
 
Makes the content unselectable.
 
HTML
<p>You can select me.</p>
 <p class="unselectable">You can't select me!</p>
 
 
CSS
.unselectable {
   user-select: none;
@@ -385,4 +398,4 @@ var y = e.pageY - btn.offsetTop - btn.offsetParent.offsetTop
   text-overflow: ellipsis;
   width: 200px;
 }
-
 
Demo
 
 
 This text will be truncated if it exceeds 200px in width. 
 
  
Explanation
 
     
  1. overflow: hidden prevents the text from overflowing its dimensions (for a block, 100% width and auto height).
    2.  
  2. white-space: nowrap prevents the text from exceeding one line in height.
    3.  
  3. text-overflow: ellipsis makes it so that if the text exceeds its dimensions, it will end with an ellipsis.
    4.  
  4. width: 200px; ensures the element has a dimension, to know when to get ellipsis
    5.  
 
Browser support
 
 
 98.4% 
 
 
⚠️ Only works for single line elements.
   
 
 
 
   
+

Demo

This text will be truncated if it exceeds 200px in width.

Explanation

  1. overflow: hidden prevents the text from overflowing its dimensions (for a block, 100% width and auto height).
  2. white-space: nowrap prevents the text from exceeding one line in height.
  3. text-overflow: ellipsis makes it so that if the text exceeds its dimensions, it will end with an ellipsis.
  4. width: 200px; ensures the element has a dimension, to know when to get ellipsis

Browser support

98.4%

⚠️ Only works for single line elements.

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