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CSS Base

Vendor Prefixing

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


Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

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.

              <div id="app">
  <button v-on:click="show = !show">
    {{ label }}
  <transition name="slide">
    <div v-if="show" class="panel">
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent nec tempor elit, non sagittis risus. Duis odio metus, vulputate id augue luctus, maximus elementum odio. Nunc vel auctor lacus, a tincidunt purus. Pellentesque sed nisi purus. Ut hendrerit odio sit amet lobortis scelerisque. Integer tortor enim, condimentum vitae ipsum ac, facilisis tincidunt ligula. Etiam at bibendum nulla, id faucibus enim. Aenean varius sagittis lorem, ut maximus diam gravida at.
              body {
  padding: 20px;
  font: 16px/1.4 sans-serif;
button {
  font-size: 1.25rem;
  padding: 10px;
  background: #0bd;
  color: #fff;
  border: none;
  cursor: pointer;
  outline: none;
button:hover {
  background: #0090aa;

.panel {
  background: #eee;
  padding: 18px;
  transform-origin: 0 0;

/* Animation */
.slide-enter-active, .slide-leave-active {
  transition: .5s;
.slide-enter, .slide-leave-to {
  transform: scaleY(0);
              new Vue({
  el: "#app",
  data: {
    show: true
  computed: {
    label: function() {
      return this.show ? "閉じる" : "開く";

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