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


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.


                <div class="codepen-container">


<div class="codepen-container">

<!-- pattern markup -->
<h4>Error Message</h4>

<div class="feedback-message error">
  Error Message. Lorem ipsum dolor sit amet, consectetur adipisicing elit.
  Tempora, <a href="#">dignissimos atque</a> temporibus quibusdam placeat omnis
  doloremque autem
<!-- /pattern markup -->

<!-- Two closing divs - not an error  -->




                /* THIS JS IS NOT PART OF ENTERPRISE. It is for administrative use only. */ 

/* Uncomment first section to activate blackout on this pen ONLY. The alternative would be to change classes in "_Codepen container" to enact a blackout across ALL pattern pens. 

Uncomment the second section, with new text, if message to viewer needs to be tailored for a blackout on only this pen. */

// blackout

// change message to viewer
$('').text('Sorry for any inconvenience; thanks for your patience while we update this pen.');