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CSS Base

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Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

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You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

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Code Indentation


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Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <input id="toggler" class="modal-toggler" type="checkbox" aria-hidden="true">
<section class="modal-container">
  <label for="toggler" class="modal  close-modal-area"></label>
  <div class="modal  modal-box">
    <h1>Modal Container without JS</h1>
    <label for="toggler" class="toggle-modal-button">Close</label>
<section class="content">
  <label for="toggler" class="toggle-modal-button">Show the Modal</label>
  <p>Bacon ipsum dolor sit amet short loin pork loin corned beef, swine ground round chuck ham strip steak kielbasa biltong tongue filet mignon. Strip steak meatball chicken shank leberkas kielbasa. Short ribs pork loin short loin strip steak rump ground round drumstick kielbasa pastrami hamburger pig capicola jerky. Andouille short ribs turducken jerky boudin spare ribs ham pork loin leberkas ribeye.</p>
              [aria-hidden="true"] {
  display: none;

.modal-container {
  background: rgba(black, 0.75);
  opacity: 0;
  color: white;
  width:  100%;
  height: 100%;
  position: fixed;
  top:  0;
  left: 0;
  visibility: hidden;
  transition: opacity  0.5s,
              visibility 0s linear 0.5s;
  z-index: 2;
  .modal-toggler:checked + & {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.5s;

.modal {
  position: absolute;
  top:  50%;
  left: 50%;
  padding: 2em;
  border-radius: 0.5em;
  transform: translateX(-50%) translateY(-50%);
  &.close-modal-area {
    width:  100%;
    height: 100%;
  &.modal-box {
    background: indianred;
    text-align: center;
  .content & {
    width: 100%;
    max-width: 40em;

.toggle-modal-button {
  background-color: transparent;
  color: white;
  display: inline-block;
  padding: 1em;
  cursor: pointer;
  border-radius: 0.5em;
  box-shadow: inset 0 0 1px black;
  transition: background-color 0.2s,
              color            0.2s,
              transform        0.1s linear;
  &:active {
    background-color: rgba(black, 0.25);
    box-shadow: none;
    transition: background-color 0.2s,
                color            0.2s,
                box-shadow       0.2s,
                transform        0.1s linear;
  &:active {
    transform: scale(1.2);
  .content & {
    color: rgba(black, 0.75);
    margin-bottom: 1em;

.content {
  color: peru;
  width: 90%;
  max-width: 600px;
  padding-top: 2em;
  margin: 0 auto;

html {
  box-sizing: border-box;
*, *::before, *::after {
  box-sizing: inherit;

body {
  background-color: mistyrose;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  font-weight: 600;

h1 {
  line-height: 1;

p {
  margin: 0;
  line-height: 2;

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