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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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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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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.

              <div class="spacer"></div>

<video class="video">
    <source src="http://ozywuli.github.io/videos/atoms.mp4" type="video/mp4">

              * {
   margin: 0;
   padding: 0;
   box-sizing: border-box;

html, body {
   width: 100%;
   height: 100%;

.spacer {
   height: 10000px;

.video {
   position: fixed;
   top: 50%;
   left: 50%;
   bottom: 0;
   width: 150%;
   transform: translateX(-50%) translateY(-50%);
   z-index: 1;
              let $spacer = document.querySelector('.spacer');
let $video = document.querySelector('.video');

// The height of the spacer element
let spacerHeight = $spacer.clientHeight;
// the height of the viewport
let viewportHeight = document.documentElement.getBoundingClientRect().height

// We can get the total scrollable height be subtracting the spacer element's height by the viewport height
let scrollableHeight = spacerHeight - viewportHeight;
// Get the full duration of the video
let videoDuration;
// Keep track the video's playtime
let currentTime = 0;

// The scroll event handler
function handleScrollEvent(event) {
   // Here we sync the y position of the scrollbar to the progress of the video
   currentTime = (window.scrollY * videoDuration) / scrollableHeight;
   $video.currentTime = currentTime;

// Loaded Data handler, that is, the function that runs after the video is ready to play
function handleLoadedData(event) {
   // Get the full video duration
   videoDuration = $video.duration;
   // Do stuff when user scrolls
   window.addEventListener('scroll', handleScrollEvent);

// Do stuff when the video is ready to play
$video.addEventListener('loadeddata', handleLoadedData);
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