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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

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

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 class="entry nibbler">
!

CSS 

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

body
  background-color: firebrick
  position: relative
  height: 100vh
  
.entry
  position: absolute
  left: 50%
  top: 50%

  &:before,
  &:after
    display: block
    content: ''
    position: absolute
    
  &.nibbler
    width: 180px
    height: 240px
    margin-left: -(@width/2)
    margin-top: -(@height/2 + 5px)
    background-image: linear-gradient(to top, palegoldenrod 40px, transparent 40px), // chin
                      radial-gradient(black 70%, transparent 70%),
                      radial-gradient(black 70%, transparent 70%)
    background-repeat: no-repeat
    background-size: 100% 100%,
                     100% 164px,
                     48px 30px
    background-position: 0 0,
                         0 74px,
                         center 65px
    border-bottom-left-radius: 90px 88px
    border-bottom-right-radius: 100px 85px
    box-shadow: 0 7px 0 -3px black
    
    &:before
      width: 170px
      height: 42px
      margin-left: -(@width/2 - 4px)
      left: 50%
      bottom: 32px
      background: palegoldenrod
      border-top-left-radius: 100px 40px
      border-top-right-radius: 100px 40px
      border-bottom-left-radius: 20px 10px
      border-bottom-right-radius: 100px 10px
      box-shadow: inset 0 3px 0 black,
                  inset 3px 0 0 black,
                  inset 22px 0 0 palegoldenrod,
                  inset -3px -3px 0 black
    
    &:after
      width: 230px
      height: 280px
      margin-left: -(@width/2)
      left: 50%
      margin-top: -15px
      background-image: radial-gradient(circle at 57px 142px, black 7px, transparent 7px), // eyes
                        radial-gradient(circle at 43px 156px, white 33px,
                                                              black 33px,
                                                              black 35px,
                                                              transparent 35px),
                        radial-gradient(circle at 201px 140px, black 7px, transparent 7px),
                        radial-gradient(circle at 186px 154px, white 33px,
                                                              black 33px,
                                                              black 35px,
                                                              transparent 35px),
                        radial-gradient(black 70%, transparent 70%), // eyebrows
                        radial-gradient(gray 70%, transparent 70%),
                        radial-gradient(black 70%, transparent 70%),
                        radial-gradient(gray 70%, transparent 70%),
                        radial-gradient(circle at 53% 18px, black 6px, transparent 6px), // top eye
                        radial-gradient(circle at center 24px, white 20px,
                                                              black 20px,
                                                              black 23px,
                                                              transparent 23px),
                        linear-gradient(87deg, transparent 35%, black 35%, black 65%, transparent 65%),
                        radial-gradient(black 65%, transparent 65%), // nose thing
                        radial-gradient(palegoldenrod 65%, transparent 65%),
                        radial-gradient(palegoldenrod 65%, transparent 65%),
                        radial-gradient(black 65%, transparent 65%),
                        radial-gradient(circle at 50px 215px, palegoldenrod 10px, transparent 10px), // mouth cover
                        linear-gradient(75deg, transparent 45%, white 45%), // left tooth
                        linear-gradient(-75deg, transparent 45%, white 45%),
                        linear-gradient(75deg, transparent 45%, black 45%),
                        linear-gradient(-75deg, transparent 45%, black 45%),
                        linear-gradient(75deg, transparent 45%, white 45%), // right tooth
                        linear-gradient(-75deg, transparent 45%, white 45%),
                        linear-gradient(75deg, transparent 45%, black 45%),
                        linear-gradient(-75deg, transparent 45%, black 45%)
      background-repeat: no-repeat
      background-size: 100% 100%, 100% 100%, 100% 100%, 100% 100%,
                       60px 30px, // eyebrows
                       28px 20px,
                       60px 30px,
                       28px 20px,
                       100% 100%, 100% 100%, 40px 50px,
                       36px 15px, // nose thing
                       64px 25px,
                       44px 15px,
                       68px 27px,
                       100% 100%, // mouth cover
                       10px 32px, // left tooth
                       10px 32px,
                       15px 35px,
                       15px 35px,
                       10px 34px, // right tooth
                       10px 34px,
                       15px 37px,
                       15px 37px
      background-position: 0 0, 0 0, 0 0, 0 0,
                           15px 110px, // eyebrows
                           44px 111px,
                           150px 105px,
                           153px 106px,
                           0 0, 0 0, 96px 40px,
                           center 175px, // nose thing
                           center 169px,
                           center 186px,
                           center 169px,
                           0 0, // mouth cover
                           74px 223px, // left tooth
                           84px 223px,
                           70px 223px,
                           84px 223px,
                           155px 221px, // right tooth
                           165px 221px,
                           151px 220px,
                           165px 220px
!

JS
!
999px

Console