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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.

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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.

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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.

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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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 

              
                .div
!

CSS 

              
                *, *::after, *::before
  box-sizing border-box

:root
  --width 30vh
  --height 50vh
  --depth 5vh
  --ground 35vh
  --bg rgba(0,0,0,1)
  --stroke rgba(255,255,255,1)
  --trans rgba(0,0,0,0)
  --border 0.35vh
  --border-n calc(var(--border) * -1)
  --radius calc(var(--width) / 2)
  --duration 3.5s

html, body
  height 100%

body
  color var(--stroke)
  background-color var(--bg)
  background-image linear-gradient(158deg, #353535, transparent)
  background-attachment fixed
  overflow hidden
  display flex
  justify-content center
  align-items center

.div, .div::before, .div::after
  animation-duration 8s
  animation-timing-function ease-out
  // animation-delay 0
  animation-iteration-count infinite
  // animation-direction forwards
  // animation-fill-mode both


// div ------------------------------------------------------------
.div
  position relative
  width var(--width)
  height var(--height)
  border var(--border) solid var(--stroke)
  animation-name Div

@keyframes Div
  from, 20%
    border-top-left-radius 0
    border-top-right-radius 0
    box-shadow \ 
      0 0 0 var(--border-n) inset var(--bg), //arch
      0 0 0 inset var(--stroke), // arch
      0 0 0 var(--border-n) var(--bg), // stair
      0 0 0 var(--stroke), // stair
      0 0 0 var(--border-n) var(--bg), // frame
      0 0 0 0 var(--stroke) // frame

  40%
    border-top-left-radius var(--radius)
    border-top-right-radius var(--radius)
    box-shadow \ 
      var(--depth) 1.5vh 1px inset var(--bg), //arch
      var(--depth) 1.5vh 0 var(--border) inset var(--stroke), // arch
      0 0 0 var(--border-n) var(--bg), // stair
      0 0 0 var(--stroke), // stair
      0 0 0 var(--border-n) var(--bg), // frame
      0 0 0 0 var(--stroke) // frame

  60%, 80%
    border-top-left-radius var(--radius)
    border-top-right-radius var(--radius)
    box-shadow \ 
      var(--depth) 1.5vh 1px var(--bg) inset, //arch
      var(--depth) 1.5vh 0 var(--border) var(--stroke) inset, // arch
      0 var(--depth) 0 var(--border-n) var(--bg), // stair
      0 var(--depth) 0 var(--stroke), // stair
      0 0 0 calc(var(--depth) - var(--border)) var(--bg), // frame
      0 0 0 var(--depth) var(--stroke) // frame

  to
    border-top-left-radius 0
    border-top-right-radius 0
    box-shadow \ 
      0 0 0 var(--border-n) inset transparent, //arch
      0 0 0 inset transparent, // arch
      0 0 0 var(--border-n) transparent, // stair
      0 0 0 var(--stroke), // stair
      0 0 0 var(--border-n) transparent, // frame
      0 0 0 0 transparent // frame

  80%
    background transparent
  81%
    background white
  82%
    background transparent

// div::before ------------------------------------------------------------
div::before
  content ""
  position absolute
  top var(--border-n)
  z-index -1
  height var(--height)
  border-top-left-radius var(--radius)
  border-top-right-radius var(--radius)
  animation-name Div_before

@keyframes Div_before
  from, 40%
    left 0
    width var(--width)
    box-shadow \ 
        0 0 0 var(--border-n) var(--bg), // depth
        0 0 0 var(--stroke)

  60%, 80%
    width calc(var(--width) + var(--depth))
    left calc(var(--depth) * -1)
    border-top-left-radius var(--radius)
    border-top-right-radius var(--radius)
    box-shadow \ 
      var(--depth) 0 0 calc(var(--depth) - var(--border)) var(--bg), // depth
      var(--depth) 0 0 var(--depth) var(--stroke)

  to
    left 0
    width var(--width)
    border-top-left-radius 0
    border-top-right-radius 0
    box-shadow \ 
        0 0 0 var(--border-n) transparent, // depth
        0 0 0 transparent

// div::after ------------------------------------------------------------
.div::after
  content "~ toabr.de ~"
  position fixed
  width 100vw
  height var(--ground)
  bottom 0
  left 0
  z-index -2
  font-size 3.5vh
  text-align center
  animation-name Div_after
  animation-timing-function ease-in

@keyframes Div_after
  from, 40%
    box-shadow \
      calc(50vw - var(--width) / 2) calc((100vh - var(--height)) / -2) 1px inset transparent, // left box
      calc(-50vw - var(--width) / 2) 0 transparent, // left box
      calc(-50vw + var(--width) / 2) calc((100vh - var(--height)) / -2) 1px inset transparent, // right box
      calc(50vw + var(--width) / 2) 0 transparent // right box
      
  80%
    box-shadow \
      calc(50vw - var(--width) / 2) calc((100vh - var(--height)) / -2) 1px inset var(--bg), // left box
      calc(-50vw - var(--width) / 2) var(--border-n) var(--stroke), // left box
      calc(-50vw + var(--width) / 2) calc((100vh - var(--height)) / -2) 1px inset var(--bg), // right box
      calc(50vw + var(--width) / 2) var(--border-n) var(--stroke) // right box
    
  // Text --------------------------
  from, 60%, to
    padding-left 0
    font-size 3.5vh
    color var(--stroke)
  
  85%, 98%
    padding-left 8.5vw
    font-size 0
    color transparent

  98%, to
    padding-left 0
    font-size 3.5vh
!

JS
!
999px

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