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HTML

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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

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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.

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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).

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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.

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HTML 

              
                <div class="wrapper">
  <div class="content">
    <header class="header">
      <div class="layers">
        <div class="layer-title">
          <div class="subtitle">Welcome to</div>
          <div class="title">Fairy Forest</div>
        </div>
        <div class="layer layer-base"></div>
        <div class="layer layer-middle"></div>
        <div class="layer layer-front"></div>
      </div>
    </header>
    <article class="article">
      <div class="article-content">
        <h2 class="article-title">To be continued</h2>
        <p class="article-text">
          Lorem ipsum dolor sit, amet consectetur adipisicing elit. Omnis
          error provident dignissimos facere. Repellendus tempore autem qui!
          Quia magnam tempora esse id necessitatibus corrupti mollitia
          expedita sapiente cum rerum, ut dicta laboriosam!
        </p>
      </div>
      <div class="copy">© WebDesign Master</div>
    </article>
  </div>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Raleway:wght@100;300;400;700;900&display=swap');

:root {
  --scrollTop: 0;
  --index: calc(1vw + 1vh);
  --transition: transform 0.75s cubic-bezier(0.075, 0.5, 0, 1);
}

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

body {
  background-color: #010101;
  font-family: 'Raleway', sans-serif;
  line-height: 1.55;
}

.header {
  position: relative;
}

.header::after {
  content: '';
  position: absolute;
  bottom: calc(var(--index) * -4.5);
  z-index: 100;
  width: 100%;
  height: calc(var(--index) * 10);
  background-image: url('https://i.ibb.co/DM2Knwf/ground.png');
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
}

.layers {
  display: flex;
  position: relative;
  height: 100vh;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  text-align: center;
}

.layer-base {
  background-image: url('https://i.ibb.co/gjgkdXX/layer-base.png');
  will-change: transform;
  position: absolute;
  height: 100%;
  width: 100%;
  z-index: 0;
  transform: translateY(calc(var(--scrollTop) / 1.6));
  background-size: cover;
  background-position: center;
  transition: var(--transition);
}

.layer-middle {
  background-image: url('https://i.ibb.co/bs5VtZj/layer-middle.png');
  will-change: transform;
  position: absolute;
  height: 100%;
  width: 100%;
  z-index: 2;
  transform: translateY(calc(var(--scrollTop) / 2.5));
  background-size: cover;
  background-position: center;
  transition: var(--transition);
}

.layer-front {
  background-image: url('https://i.ibb.co/1fKwBmW/layer-front.png');
  will-change: transform;
  position: absolute;
  height: 100%;
  width: 100%;
  z-index: 2;
  transform: translateY(calc(var(--scrollTop) / 5.7));
  background-size: cover;
  background-position: center;
  transition: var(--transition);
}

.layer-title {
  will-change: transform;
  position: relative;
  z-index: 1;
  color: #e7e7e0;
  transform: translateY(calc(var(--scrollTop) / 2));
  transition: var(--transition);
  text-shadow: 0 0 15px #9d822b;
  text-transform: uppercase;
  font-weight: 900;
}

.title {
  margin-bottom: 80px;
  font-size: calc(var(--index) * 2.65);
	letter-spacing: calc(var(--index) / 2.25);
}

.subtitle {
  margin-top: calc(var(--index) * -0.75);
  font-size: calc(var(--index) / 1.175);
	letter-spacing: calc(var(--index) / 3.5);
}

.article {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: transparent;
  background-image: url('https://i.ibb.co/ryQdX3b/dungeon.jpg');
  background-size: cover;
  background-position: center;
  color: #e7e7e0;
  text-align: center;
  top: -1px;
  z-index: 10;
}
.article-title {
  text-transform: uppercase;
  font-size: calc(var(--index) * 1.8);
  letter-spacing: calc(var(--index) / 7.5);
  transform: translateY(calc(var(--scrollTop) / -7.5));
  transition: var(--transition);
  will-change: transform;
}
.article-text {
  max-width: calc(var(--index) * 30);
  font-size: calc(var(--index) * 0.9);
  margin-top: calc(var(--index) / 1.25);
  transform: translateY(calc(var(--scrollTop) / -7.5));
  transition: var(--transition);
  will-change: transform;
}
.content {
  will-change: transform;
}

.copy {
  position: absolute;
  bottom: calc(var(--index) * 2.5);
  opacity: 0.45;
  font-size: calc(var(--index) * 0.75);
  letter-spacing: calc(var(--index) / 37.5);
}
!

JS 

              
                gsap.registerPlugin(ScrollTrigger, ScrollSmoother)
ScrollSmoother.create({
	wrapper: '.wrapper',
	content: '.content'
});

const handleScroll = () => {
  const scrollTop = document.documentElement.scrollTop;
  document.documentElement.style.setProperty('--scrollTop', `${scrollTop}px`);
}

document.addEventListener('scroll', () => {
  requestAnimationFrame(handleScroll);
});
!
999px

Console