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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.

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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.

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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
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CSS 

              
                body {
  --skin: lightgray; #da7;
  --fur: gray; #963;
  --line: #222;
  --mouth: #d00;
  --ground: #77aa77;
  --sky: #ddeeff;
  --light: #f4f6f8;
  --astro1: #ffe;
  --astro2: #ffe;
  --star: var(--sky);
  /* night mode */
/*   --sky: #369;
  --astro1: var(--sky);
  --star: #ffe;
  --skin: #777;
  --fur: #444; */
  width: 1vmin;
  height: 1vmin;
  background: var(--light);
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-6vmin, -6vmin);
  box-shadow:
    /* banana */
    27vmin -32.3vmin 0 .6vmin #874a13,
    34vmin -32vmin 0 6.5vmin #fff,
    32vmin -30vmin 0 5.5vmin #ffdb3c,
    31vmin -28vmin 0 5vmin #fdca17,
    32vmin -29vmin 0 10vmin #fff,
    23vmin -18vmin 0 4vmin #fff,
    18vmin -13vmin 0 2vmin #fff,
    15vmin -10vmin 0 1vmin #fff,
    /* eyes */
    0.5vmin 0.5vmin 0 1vmin var(--line),
    6vmin 0 var(--light),
    6.6vmin 0.5vmin 0 1vmin var(--line),
    /* nostrils */
    3vmin 3vmin 0 -0.125vmin var(--line),
    4vmin 3vmin 0 -0.125vmin var(--line),
    /* mouth */
    3.5vmin 8vmin 0 1.25vmin var(--skin),
    3.5vmin 7vmin 0 1vmin var(--mouth), 
    /* face */
    -0.5vmin -1vmin 0 4vmin var(--skin),
    7.5vmin -1vmin 0 4vmin var(--skin),
    3.5vmin 5vmin 0 4vmin var(--skin),
    /* head */
    3.5vmin 0 0 9vmin var(--fur),
    /* ears */
    -6vmin 1vmin 0 2vmin var(--skin),
    13vmin 1vmin 0 2vmin var(--skin),
    /* ear lobs */
/*     -5vmin 3vmin 0 1vmin var(--skin),
    12vmin 3vmin 0 1vmin var(--skin), */
    /* body option 1 */
/*     3.75vmin 19vmin 0 10vmin var(--fur), */
    /* body option 2 */
    3.5vmin 14vmin 0 8vmin var(--fur),
    3.5vmin 16.5vmin 0 7.75vmin var(--fur),
    3.5vmin 19vmin 0 7.5vmin var(--fur),
    3.5vmin 21vmin 0 7.25vmin var(--fur),
    3.5vmin 23vmin 0 7vmin var(--fur),
    /* legs */
    -13.5vmin 45.25vmin 0 0.25vmin var(--skin),
    -12vmin 45.25vmin 0 0.25vmin var(--skin),
    -10.5vmin 45.25vmin 0 0.25vmin var(--skin),
    -8.5vmin 45vmin 0 0.5vmin var(--skin),
    -11vmin 42.5vmin 0 1vmin var(--skin),
    -11vmin 41vmin 0 1vmin var(--fur),
    -11vmin 43vmin 0 2.25vmin var(--skin),
    22.5vmin 45.25vmin 0 0.25vmin var(--skin),
    21vmin 45.25vmin 0 0.25vmin var(--skin),
    19.5vmin 45.25vmin 0 0.25vmin var(--skin),
    17.5vmin 45vmin 0 0.5vmin var(--skin),
    20vmin 42.5vmin 0 1.25vmin var(--skin),
    20vmin 41vmin 0 1vmin var(--fur),
    20vmin 43vmin 0 2.25vmin var(--skin),
    0 calc(400vmax + 44vmin) 0 400vmax var(--ground),
    4.5vmin 45vmin 0 13vmin var(--sky),
    -12vmin 55vmin 0 13vmin var(--sky),
    20vmin 55vmin 0 13vmin var(--sky),
    4.5vmin 65vmin 0 13vmin var(--sky),
    4.5vmin 45vmin 0 18vmin var(--fur),
    /* top-hair */
    0 -8.5vmin 0 2vmin var(--sky),
    1vmin -8.5vmin 0 2vmin var(--fur),
    6.75vmin -8.25vmin 0 2.5vmin var(--sky),
    5.5vmin -8.25vmin 0 2.5vmin var(--fur),
    /* arm-1 */
    -15vmin -10vmin 0 0.75vmin var(--skin),
    -15vmin -12vmin 0 0.5vmin var(--skin),
    -16vmin -13vmin 0 0.5vmin var(--skin),
    -17.5vmin -13.5vmin 0 0.5vmin var(--skin),
    -17.5vmin -13vmin 0 0.5vmin var(--fur),
    -16vmin -12.5vmin 0 0.5vmin var(--fur),
    -15.25vmin -10.5vmin 0 0.75vmin var(--fur),
    -17vmin -11vmin 0 1.25vmin var(--skin),
    -18.5vmin -10vmin 0 1vmin var(--fur),
    -17vmin -11vmin 0 2vmin var(--skin),
    -7vmin -3vmin 0 11vmin var(--sky),
    -5vmin -18vmin 0 15vmin var(--sky),
    -7vmin -3vmin 0 15vmin var(--fur),
    /* arm-2 */
    26.5vmin 25.5vmin 0 1.5vmin var(--skin),
    24.5vmin 25.5vmin 0 0.75vmin var(--skin),
    25.5vmin 27vmin 0 0.5vmin var(--skin),
    26.75vmin 27.5vmin 0 0.5vmin var(--skin),
    28vmin 27vmin 0 0.5vmin var(--skin),
    26.5vmin 23vmin 0 1vmin var(--fur),
    26.6vmin 25.5vmin 0 2vmin var(--skin),
    13vmin 22vmin 0 11vmin var(--sky),
    27vmin 35vmin 0 11vmin var(--sky),
    13vmin 22vmin 0 15vmin var(--fur),
    /* tail */
    -40vmin -15vmin 0 0.75vmin var(--fur),
    -43vmin -13vmin 0 3vmin var(--sky),
    -34.65vmin -6.25vmin 0 7vmin var(--sky), 
    -36.25vmin -4vmin 0 7vmin var(--sky), 
    -41.25vmin -3vmin 0 11vmin var(--sky), 
    -35.5vmin -5vmin 0 7vmin var(--sky), 
    -34vmin -8vmin 0 7.5vmin var(--sky),
    -34vmin -8vmin 0 10vmin var(--fur),
    -15vmin -20vmin 0 20vmin var(--sky),
    -12vmin 10vmin 0 17.5vmin var(--sky),
    -12vmin 10vmin 0 20vmin var(--fur),
    /* sun/moon/stars */
    35vmin -55vmin 0 10vmin var(--astro1),
    30vmin -55vmin 0 15vmin var(--astro2),
    -20vmin -60vmin 0 0.25vmin var(--star),
    0vmin -90vmin 0 0.25vmin var(--star),
    20vmin -120vmin 0 0.25vmin var(--star),
    30vmin -100vmin 0 0.25vmin var(--star),
    -30vmin -115vmin 0 0.25vmin var(--star),
    -10vmin -150vmin 0 0.25vmin var(--star),
    
    /* sky/background */
    0 0 0 200vmax var(--sky);
}
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