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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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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-.

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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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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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HTML 

              
                <link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@100;200;400&display=swap" rel="stylesheet">

#index
  .bg
    .bg-left
    .bg-right

  .date.date-left
    span F
    span r
    span i
    span d
    span a
    span y
    span ,
    span S
    span e
    span p
    span t
    span
    span 2
    span 4
    span t
    span h
    span ,
    span 2
    span 1
    span :
    span 0
    span 0
    span -
    span 2
    span 3
    span :
    span 0
    span 0
    span ,
  .date.date-right
    span F
    span r
    span i
    span d
    span a
    span y
    span ,
    span S
    span e
    span p
    span t
    span
    span 2
    span 4
    span t
    span h
    span ,
    span 2
    span 1
    span :
    span 0
    span 0
    span -
    span 2
    span 3
    span :
    span 0
    span 0
    span ,
!

CSS 

              
                html {
  font-size: 10px;
  overflow: hidden;
}

html,
body {
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
}

body {
  position: relative;
}

::selection {
  background: transparent;
  color: transparent;
}

.tp-dfwv {
  z-index: 9;
  top: 94px;
  user-select: none;
}

.date {
  display: flex;
  z-index: 8;
  position: absolute;
  font-size: 20rem;
  color: #fff;
  letter-spacing: -0.08em;
  line-height: 1.25;
  user-select: none;
  font-family: 'Roboto Mono', monospace;
  font-weight: 400;
  // mix-blend-mode: difference;
  writing-mode: vertical-rl;
  white-space: nowrap;
}

.date span {
  position: absolute;
  top: 0;
  left: 0;
  display: block;
}

.date-left {
  top: 0;
  left: -48px;
  color: #f1faee;
}

.date-right {
  top: 0;
  right: 190px;
  color: #e63946;
}

.bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  
  > div {
    position: absolute;
    top: 0;
    width: 50%;
    height: 100%;
  }
  
  &-left {
    left: 0;
    background-color: #e63946;
  }
  
  &-right {
    right: 0;
    background-color: #f1faee;
  }
}
!

JS 

              
                // based on this code
// https://codepen.io/supah/pen/xxZMdNW

console.clear()

/*--------------------
Vars
--------------------*/
const $menu = document.getElementById('index')
const $items = document.querySelectorAll('.date-left span')
const $items2 = document.querySelectorAll('.date-right span')
let menuHeight = $menu.clientHeight
let itemHeight = $items[0].clientHeight
let wrapHeight = $items.length * itemHeight

let scrollSpeed = 0
let oldScrollY = 0
let scrollY = 0
let y = 0

/*--------------------
Lerp
--------------------*/
const lerp = (v0, v1, t) => {
  return v0 * ( 1 - t ) + v1 * t
}

/*--------------------
Dispose
--------------------*/
const dispose = (scroll) => {
  gsap.set($items, {
    y: (i) => {
      return i * itemHeight + scroll
    },
    modifiers: {
      y: (y) => {
        const s = gsap.utils.wrap(-itemHeight, wrapHeight - itemHeight, parseInt(y))
        return `${s}px`
      }
    }
  })
  gsap.set($items2, {
    y: (i) => {
      return i * itemHeight - scroll
    },
    modifiers: {
      y: (y) => {
        const s = gsap.utils.wrap(-itemHeight, wrapHeight - itemHeight, parseInt(y))
        return `${s}px`
      }
    }
  })
}
dispose(0)

/*--------------------
Wheel
--------------------*/
const handleMouseWheel = (e) => {
  scrollY -= e.deltaY
}

/*--------------------
Listeners
--------------------*/
$menu.addEventListener('mousewheel', handleMouseWheel)
$menu.addEventListener('selectstart', () => { return false })

/*--------------------
Resize
--------------------*/
window.addEventListener('resize', () => {
  menuHeight = $menu.clientHeight
  itemHeight = $items[0].clientHeight
  wrapHeight = $items.length * itemHeight
})

/*--------------------
Render
--------------------*/
const render = () => {
  requestAnimationFrame(render)
  y = lerp(y, scrollY, .1)
  dispose(y)

  scrollSpeed = y - oldScrollY
  oldScrollY = y

  gsap.to($items, {
    scale: 1 - Math.min(100, Math.abs(scrollSpeed)) * .005,
    rotate: scrollSpeed * 0.2,
    skewY: scrollSpeed * 0.8,
    skewX: scrollSpeed * 0.8,
  })

  gsap.to($items2, {
    scale: 1 - Math.min(100, Math.abs(scrollSpeed)) * .005,
    rotate: scrollSpeed * 0.2,
    skewY: scrollSpeed * 0.8,
    skewX: scrollSpeed * 0.8,
  })
}
render()
!
999px

Console