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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

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

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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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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

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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About External Resources

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.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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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About Packages

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.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                -
  const ITEMS = [
    {
      title: 'Impossible Checkbox',
      link: "https://codepen.io/jh3y/pen/LYNZwGm",
      src: "https://assets.codepen.io/605876/impossible-checkbox.png"
    },
    {
      title: "Newton's Light Bulbs",
      link: "https://codepen.io/jh3y/pen/abzeaWJ",
      src: "https://assets.codepen.io/605876/newtons-lightbulbs.png"
    },
    {
      title: "Pure CSS Tic Tac Toe",
      link: "https://codepen.io/jh3y/pen/BVaGKP",
      src: "https://assets.codepen.io/605876/css-tic-tac-toe.png"
    },
    //- {
    //-   title: "Cards Against Developers",
    //-   link: "https://codepen.io/jh3y/pen/JZbKpp",
    //-   src: "https://assets.codepen.io/605876/cards-against-developers.png"
    //- },
    {
      title: "Turbo Kitty",
      link: "https://codepen.io/jh3y/pen/bGEBKoy",
      src: "https://assets.codepen.io/605876/turbo-kitty.png"
    },
    //- {
    //-   title: "Glitchy CSS Text",
    //-   link: "https://codepen.io/jh3y/pen/jOOQjYP",
    //-   src: "https://assets.codepen.io/605876/cards-against-developers.png"
    //- }
    {
      title: "Pure CSS Drawers",
      link: "https://codepen.io/jh3y/pen/mLaXRe",
      src: "https://assets.codepen.io/605876/css-drawers.png?format=auto"
    },
    {
      title: "CSS 3D Studio Room",
      link: "https://codepen.io/jh3y/pen/XWdQBRx",
      src: "https://assets.codepen.io/605876/3d-studio-room.png"
    },
    //- {
    //-   title: "T-Shirt Cannon Button",
    //-   link: "https://codepen.io/jh3y/pen/eYpmBxQ",
    //-   src: "https://assets.codepen.io/605876/t-shirt-cannon.png"
    //- },
    {
      title: "Code Name: RamBear",
      link: "https://codepen.io/jh3y/pen/QWyYZbP",
      src: "https://assets.codepen.io/605876/rambear.png"
    },
    {
      title: "Care Bear Needs Love",
      link: "https://codepen.io/jh3y/pen/RwPrOoz",
      src: "https://assets.codepen.io/605876/care-bear-needs-love.png"
    },
    {
      title: "HSL Dimmer Switch",
      link: "https://codepen.io/jh3y/pen/MWYJPwZ",
      src: "https://assets.codepen.io/605876/hsl-dimmer.png"
    },
    {
      title: "Tuggable Light Bulb",
      link: "https://codepen.io/jh3y/pen/VwjgdLj",
      src: "https://assets.codepen.io/605876/tuggable-lightbulb.png"
    }
  ]

.top-picks
  h1.top-picks__title Top 10 in Jhey's Pens Today
  ul.top-picks__track
    for ITEM, index in ITEMS
      li.item.top-picks__item
        a.item__card(href=ITEM.link target="_blank" rel="noopener noreferrer")
          img(src=ITEM.src)
          span= ITEM.title
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Roboto:wght@900&display=swap');

*
*:before
*:after
  box-sizing border-box
  font-family 'Roboto', sans-serif

// Card measure was 165 x 240
// Font-size was about 110
// Card margin was about 60
:root
  --bg hsl(0, 0%, 8%)
  --size 50vmin
  --height var(--size)
  --width calc(0.6875 * var(--size))
  --font-size calc(0.74 * var(--size))
  --gap calc(0.22 * var(--size))


body
  background var(--bg)
  min-height 100vh
  display flex
  align-items center
  justify-content start
  font-family 'Roboto', sans-serif


.top-picks
  max-width 100%
  padding 0 2rem

  &__track
    height var(--height)
    margin 0
    padding 0
    display flex
    list-style-type none
    padding 0 var(--gap)
    max-width 100%
    overflow-x auto
    overflow-y visible
    counter-reset index
    scroll-snap-type x mandatory
    

  &__title
    color hsl(0, 0%, 100%)
    font-size clamp(1.2rem, 5vmin, 3rem)
    font-weight 700

  &__item
    overflow hidden
    width calc(var(--width) + var(--gap))
    flex 0 0 calc(var(--width) + var(--gap))
    position relative
    list-style none
    counter-increment index
    padding-left var(--gap)
    scroll-snap-align center
    
    &.item:hover
      img
        filter saturate(100%)

    .item__card
      width var(--width)
      position absolute
      right 0
      top 0
      bottom 0
      border-radius 2vmin
      background hsl(0, 0%, 14%)
      overflow-x hidden
      
      &:after
        position absolute
        content ''
        bottom 1rem
        right 1rem
        height 1.5rem
        width 1.5rem
        background-image url("https://assets.codepen.io/605876/avatar.png")
        background-size cover
        background-repeat no-repeat

      img
        position absolute
        height 100%
        width 100%
        object-fit cover
        transition filter 0.2s
        filter saturate(50%)

      span
        text-decoration none
        position absolute
        top 2rem
        right 2rem
        max-width 50%
        text-align right
        color white
        font-weight bold
        font-size clamp(1rem, 2vmin, 2rem)
        text-shadow 0.5vmin 0 2vmin var(--bg)

    &:after
      content counter(index)
      position absolute
      color var(--bg)
      font-size var(--font-size)
      line-height 0.7
      bottom 0
      font-weight bold
      letter-spacing -5vmin
      left 0
      -webkit-text-stroke 0.5vmin hsl(0, 0%, 100%)
      text-shadow 1vmin 0 4vmin var(--bg)
      transform translate(-14%, 0)
!

JS 

              
                // Nope

// Inspecting the original shows how they are clipping the numbers
// Check the card border-radius and see how the "2" is clipped
// https://twitter.com/CodePen/status/1329534673987506184?s=20

// Made this one with scroll-snap and took some of my demos and put them in ;D
!
999px

Console