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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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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


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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.

              <!-- Read the article: http://sassbreak.com/viewport-relative-headings-with-sass -->
<h1 class="headline">An Awesome Headline</h1>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus sit amet erat ligula. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Proin porttitor vulputate augue et sagittis. Proin varius ac urna non laoreet. Aliquam lacinia sapien sed.</p>
              // Read the article: http://sassbreak.com/viewport-relative-headings-with-sass

// Max breakpoint
$max-breakpoint: 1025;

// This could be one of your media query breakpoint variables
$wide-screen: "(min-width: #{$max-breakpoint}px)"; 

// Function
@function get-vw($target) {
  // 1 vw is equal to 1% of the viewport width
  $vw-context: ($max-breakpoint * .01) * 1px; // 1% viewport width
  @return ($target/$vw-context) * 1vw;

// Mixin
@mixin vw($size) {
  font-size: get-vw($size);
  // Prevent font-size from getting too big
  @media #{$wide-screen} {
    font-size: $size;

// If the width of the viewport is 1025px or wider, the font size will remain at 72px. Otherwise, the value will adjust as 7.2vw.
.headline {
  font-size: 4.5em; // Fallback
  @include vw(72px);
              // Read the article: http://sassbreak.com/viewport-relative-headings-with-sass
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