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.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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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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

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                <!-- Embedded styles -->
  div { 
    border: 1px solid red;
    height: 100px;
    width: 100px;
  body {
    display: block;
<link rel="stylesheet" href="data:text/css;charset=utf-8;base64,LyogVGhlc2UgYXJlIE5PVCBpZ25vcmVkLCBiZWNhdXNlIENTUyBhY3R1YWxseSBkb2Vzbid0IGRpc3Rpbmd1aXNoIGVtYmVkZGVkIGFuZCBsaW5rZWQgc3R5bGVzLCBvbmx5IG9yZGVyIGluIHdoaWNoIHRoZXkgYXJlIGluY2x1ZGVkIG1hdHRlcnMgKi8NCmRpdiB7DQogIGJvcmRlcjogMXB4IHNvbGlkIGJsdWU7DQogIGhlaWdodDogMjAwcHg7DQogIHdpZHRoOiAyMDBweDsNCn0NCg0KLyogUHJlc2VudGF0aW9uYWwgU3R5bGVzICovDQpib2R5IHsNCiAgYWxpZ24taXRlbXM6IGNlbnRlcjsNCiAgZGlzcGxheTogZmxleDsNCiAganVzdGlmeS1jb250ZW50OiBjZW50ZXI7DQogIGhlaWdodDogMTAwdmg7DQp9" title="Embedded styles DON'T override stylesheet rules">



                /* The last <link> in the <body> has the same styles as here (encoded as Data URI). Those styles are NOT ignored, because CSS actually doesn't distinguish external and embedded styles, only the general order of styles matters
div {
  border: 1px solid blue;
  height: 200px;
  width: 200px;

These Presentational Styles also work from the linked style, overriding the embedded styles above:

body {
  align-items: center;
  display: flex;
  justify-content: center;
  height: 100vh;