Pen Settings

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.

+ add another resource

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.

+ add another resource

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.

⚠️ This feature can only be used by logged in users.

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.

              <h1>Box Sizing Demo: Change the Padding with this Range Input 

<i class="fa fa-heart"></i></h1> 
<div class="container">
<div class="row">
<div class="col-md-4 col-md-offset-4">


  <input type="range" value="0" min="0" max="100">
<div class="border-box">
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi lacinia, lacus nec laoreet interdum, dui sem aliquet leo, a egestas ipsum massa vitae augue. Vestibulum et interdum augue. Phasellus et nisi metus. Donec accumsan quis velit at varius. Suspendisse tincidunt eu orci eget tincidunt. In consectetur tincidunt lectus. Vestibulum mollis, dui a congue pharetra, ligula mauris venenatis nibh, non tincidunt turpis nisl in mi. Nam placerat erat non justo viverra dictum. Donec arcu arcu, interdum et dictum ac, egestas et nibh. Cras tempor, quam sit amet euismod aliquam, erat ex pretium erat, pellentesque dapibus arcu nulla eu tellus. Sed non sapien ultricies, bibendum ipsum vitae, aliquam metus. Morbi interdum ullamcorper turpis at volutpat. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Suspendisse tincidunt dictum nisl ut vehicula.</p>
              .border-box {
  background: #fff;
h1 {
  text-align: center;
  margin-bottom: 20px;
h1 i {
  color: pink;
body {
  background: #e3e3e3;
  padding: 40px 0;
input {
  margin-bottom: 10px;
              $(function() {
  $('input[type=range]').on('change mousemove', function() {
      $('.border-box').css('padding', $(this).val() + 'px');
🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.