Pen Settings



CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

+ add another resource


Babel includes JSX processing.

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.

+ add another resource


Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.


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.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.


  <h1>Owl brain surgery</h1>

    <p>Despite its irreverent name and precarious form, the lobotomized owl selector is no mere thought experiment for me. It is the result of ongoing experimentation into automating the layout of flow content.</p>
    <cite><a href="">Axiomatic CSS and Lobotomized Owls</a></cite>
    <img src="" alt="A Photo" />
    <figcaption>* + *</figcaption>

  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Molestiae neque consequuntur odit quis veritatis hic excepturi reiciendis sapiente dicta explicabo inventore nulla obcaecati facere voluptatibus sit ut vel, eligendi ratione.</p>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ullam dicta, illo distinctio, incidunt cumque quas similique quibusdam, ipsa suscipit laudantium deserunt eos fugiat rem nihil quam. Eligendi id, iure fugit.</p>

  <div class="module"></div>
  <section class="no-margin">
    <div class="module">module (no margin)</div>
    <div class="module">module (no margin)</div>
  <div class="module"></div>
  <div class="module"></div>

  No owls were harmed during this experiment


                html {
  font-family: Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.433;

body {
  max-width: 40em;
  margin: 1% auto 5%;

/* */
* + * {
  margin-top: 1.75em;

div:empty:before {
  content: attr(class);

article, section {
  padding: 1.25em;

article h1:after {
  content: "*";
  color: #b4d455;
  margin-left: 0.25em;

figure {
  float: right;
  max-width: 10em;
  text-align: center;

figure > * + * {
  margin-top: 0.875em;
  font-family: monospace;

figure > img {
  max-width: 100%;

figcaption {
  font-size: smaller;

blockquote {
  border-left: medium solid gainsboro;
  padding-left: 1em;

blockquote cite:before {
  content: "-";
  margin-right: 0.5em;

section {
  border: 1px solid #ccc;

* + * > footer {
  background: #b4d455;
  padding: 0.5em;
  text-align: center;

.module {
  background: #777;
  color: #fff;
  padding: 1em;

.no-margin > * + * {
  margin-top: 0;