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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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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).

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

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About External Resources

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.

You can also link to another Pen here (use the .css URL Extension) and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

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HTML 

              
                <div id="hungry"></div>
!

CSS 

              
                // #divtober 06: Hungry
// a.singlediv.com/divtober2021

black(alpha)
  rgba(0,0,0,alpha)

white(alpha)
  rgba(255,255,255,alpha)

$hippo = lightpink
$hippo-0 = alpha($hippo,0)
$hippo-drk = darken($hippo,12)

body
  min-height: 320px
  height: 100vh
  position: relative
  background-color: crimson
  text-align: center

div
  position: absolute
  left: 50%
  top: 50%

  &:before,
  &:after
    display: block
    content: ''
    position: absolute

#hungry
  width: 20em
  height: @width
  margin-left: -(@width/2)
  margin-top: -(@height/2)
  background-repeat: no-repeat
  background-image: linear-gradient(white, white),
                    linear-gradient(white, white),
                    radial-gradient(ellipse, firebrick 35%,
                                             $hippo 36%, $hippo 50%,
                                             $hippo-0 51%),
                    radial-gradient(circle, black 50%, black(0) 51%),
                    radial-gradient(circle, black 50%, black(0) 51%),
                    radial-gradient(ellipse at 50% 100%, $hippo 50%, $hippo-0 50.1%),
                    radial-gradient(ellipse at 50% 100%, $hippo-drk 50%, $hippo-0 50.1%),
                    radial-gradient(ellipse at 50% 100%, $hippo-drk 50%, $hippo-0 50.1%),
                    radial-gradient(circle, $hippo-drk 50%, $hippo-0 50.1%),
                    radial-gradient(circle, $hippo-drk 50%, $hippo-0 50.1%)
  background-size: 1em 1em, 1em 1em,
                   4.5em 5em,
                   .6em .6em, .6em .6em,
                   10em 9em,
                   17em 16em,
                   9em 6em,
                   2.5em 2.5em,
                   2.5em 2.5em
  background-position: 42% 50%, 58% 50%,
                       50% 50%,
                       47% 27%, 52.5% 27%,
                       left 50% bottom 1em,
                       left 50% bottom 1em,
                       50% 10%,
                       40% 10%,
                       60% 10%

  &:before
    width: 8em
    height: 4em
    left: 50%
    margin-left: -(@width/2)
    top: 30%
    background-color: $hippo
    background-repeat: no-repeat
    background-image: radial-gradient(circle, $hippo-drk 50%, $hippo-0 51%),
                      radial-gradient(circle, $hippo-drk 50%, $hippo-0 51%),
                      radial-gradient(circle, $hippo-drk 50%, $hippo-0 51%),
                      radial-gradient(circle, $hippo-drk 50%, $hippo-0 51%),
                      radial-gradient(circle, $hippo-drk 50%, $hippo-0 51%),
                      radial-gradient(circle, $hippo-drk 50%, $hippo-0 51%)
    background-size: .4em .4em
    background-position: 10% 30%,  5% 44%, 13% 48%,
                         90% 30%, 95% 44%, 87% 48%
    border-top-right-radius: 4em 2em
    border-top-left-radius: 4em 2em
    border-bottom-right-radius: 2em 2em
    border-bottom-left-radius: 2em 2em

  &:after
    width: 100%
    height: 100%
    background-repeat: no-repeat
    background-image: radial-gradient(circle, $hippo-drk 30%,
                                              $hippo 31%, $hippo 60%,
                                              $hippo-0 61%),
                      radial-gradient(circle, $hippo-drk 30%,
                                              $hippo 31%, $hippo 60%,
                                              $hippo-0 61%),
                      radial-gradient(circle, white 50%, white(0) 51%),
                      radial-gradient(circle, white 50%, white(0) 51%),
                      radial-gradient(circle, white 50%, white(0) 51%),
                      radial-gradient(circle, white 50%, white(0) 51%),
                      radial-gradient(circle, white 50%, white(0) 51%),
                      radial-gradient(circle, white 50%, white(0) 51%),
                      radial-gradient(circle, white 50%, white(0) 51%),
                      radial-gradient(circle, white 50%, white(0) 51%),
                      radial-gradient(circle, white 50%, white(0) 51%),
                      radial-gradient(circle, white 50%, white(0) 51%),
                      radial-gradient(circle, #ddd 50%, white(0) 51%),
                      radial-gradient(circle, #bbb 50%, white(0) 51%),
                      radial-gradient(circle, #ccc 50%, white(0) 51%),
                      radial-gradient(circle, #ccc 50%, white(0) 51%),
                      radial-gradient(circle, #ddd 50%, white(0) 51%),
                      radial-gradient(circle, #eee 50%, white(0) 51%)
    background-size: 2em 2em, 2em 2em,
                     4em 4em,
                     4em 4em, 4em 4em, 4em 4em,
                     4em 4em, 4em 4em, 4em 4em, 4em 4em, 4em 4em, 4em 4em,
                     3.5em 3.5em, 3.3em 3.3em, 3.3em 3.3em,  3.3em 3.3em, 3.5em 3.5em, 3.5em 3.5em
    background-position: 40% 30%, 60% 30%,
                         18.5% 71%,
                         9.5% 86%, 28% 85%, 65% 86%,
                         0 100%, 20% 100%, 36% 100%, 55% 100%, 75% 100%, 100% 100%,
                         12% 99%, 19% 83%, 30% 99%, 47% 99%, 65% 99%, 87% 99%
!

JS 

              
                // @lynnandtonic
// a.singlediv.com
!
999px

Console