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HTML

About HTML Preprocessors

HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

!
Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

Add External Stylesheets/Pens

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You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

Add External Scripts/Pens

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You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

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You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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Packages

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.

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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

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HTML 

              
                

 <div id="container">   
<div class="description panel blue">
    <div><h1>Layered pinning from bottom</h1>
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
   <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
</p>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin purus libero, tristique sed neque et, ullamcorper mollis justo. Donec venenatis tortor sollicitudin erat tristique, non auctor augue pretium. Fusce id mi massa. Aenean sed ornare velit. Sed quis neque felis. In ut vestibulum nunc. Fusce vehicula facilisis ipsum. Praesent interdum hendrerit lacus. Aenean vitae augue ut dolor commodo suscipit quis non orci. Quisque pulvinar nisi arcu, id convallis metus scelerisque et. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Quisque lectus diam, scelerisque non ligula ac, tincidunt interdum quam. Fusce neque arcu, cursus in molestie non, consectetur ut libero. Quisque pulvinar pellentesque nibh, eu feugiat leo porta et. Nulla pharetra, lacus et ullamcorper pretium, mi leo ultrices est, eu scelerisque arcu lacus vitae sapien.</p>
      <div class="scroll-down">Scroll down<div class="arrow"></div></div>
    </div>
  </div>


  <section class="panel red">
    <div>
      ONE
    </div>

    <p>
          Aliquam a porttitor purus. Nulla aliquam gravida blandit. Aliquam purus dolor, luctus at elit id, laoreet condimentum odio. Nunc ex libero, iaculis a lobortis et, viverra quis dolor. Mauris ac condimentum tellus. Proin fringilla vitae elit luctus aliquet. Proin in efficitur nisl, in porttitor arcu. Mauris gravida metus metus, et consequat purus hendrerit nec. Nam ac feugiat nisi. Nullam tempor tortor vitae efficitur convallis. Pellentesque et mi ac eros laoreet blandit eget eget diam. Aliquam eget mollis orci, ac varius nibh. Donec feugiat lectus eu diam malesuada, nec condimentum est lacinia. Fusce interdum elit et ante facilisis rutrum.
    </p>
  </section>
  <section class="panel orange">
    <div>
      TWO
    </div>
  </section>
  <section class="panel purple">
    THREE
  </section>

</div>





<header>
   <a href="https://greensock.com/scrolltrigger">
     <img class="greensock-icon" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/16327/scroll-trigger-logo-light.svg" width="200" height="64" />
  </a> 
</header>
!

CSS 

              
                #container {
  width: 100%;
  height: 100%; 
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
}

.panel {
  position: absolute;
  will-change: transform;
  display:block;
  height: auto;
  min-height: 100%;
  padding-top: 200px;
}
!

JS 

              
                gsap.registerPlugin(ScrollTrigger);

// On récupère tous les panels dans l'HTML
const panels = document.querySelectorAll('.panel:not(:last-child)');
// On crée une variable pour stocker la hauteur totale additionée de TOUS les panels
let totalHeight = 0;
// Pour chaque panel on ajoute sa hauteur à la variable
panels.forEach(panel => {
  totalHeight += panel.clientHeight;
});

// On crée une seule timeline avec GSAP
// Et on indique que le "end" de la timeline doit être la hauteur totale de la page (de toutes les sections)
const tl = gsap.timeline({
  scrollTrigger: {
    trigger: "#container",
    start: "top top",
    end: `+=${totalHeight}`,
    scrub: true,
    pin: true
  }
});
// Pour chaque panneau, on crée une animation GSAP
// Et on calcule sa durée sur base de sa hauteur
// Le principe avec ScrollTrigger et Scrub, c'est que la "durée de l'animation" est en fait un ratio
// Si une animation fait 2sec, et l'autre 4sec, la deuxième prendra 2x plus de temps à scroller que la première.
// Cela reviendrait au même de dire 1sec et 2sec.
// Vu que ici on parle pas de "durée en secondes" mais en fait de "temps de scroll"
panels.forEach(panel => {
  tl.to(panel, {
    yPercent: -100, 
    ease: "none",
    // Du coup ici on calcule le ratio pour chaque panel
    // Si le premier panel fait 10% de la hauteur de la page, sa durée sera de 0.1
    // si le deuxième fait 50%, sa durée sera de 0.5
    // Et si le dernier fait 40%, sa durée sera de 0.4
    duration: panel.clientHeight / totalHeight
  });
});


gsap.set(".panel", {zIndex: (i, target, targets) => targets.length - i});
!
999px

Console