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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

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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

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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 Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

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

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HTML 

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

CSS 

              
                // #divtober 15: Float
// a.singlediv.com/divtober2021

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

body
  min-height: 320px
  height: 100vh
  position: relative
  background-color: lightblue

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

  &:before,
  &:after
    display: block
    content: ''
    position: absolute
    
  @media (max-width: 400px)
    transform: scale(.8)

#float
  font-size: 10px
  width: 35em
  height: 25.5em
  margin-left: -(@width/2)
  margin-top: -(@height/2)
  background-repeat: no-repeat
  background-image: linear-gradient(#444, #444),
                    linear-gradient(#444, #444),
                    linear-gradient(150deg, gold 35%,
                                            goldenrod 36%,
                                            goldenrod 60%,
                                            gold 61%),
                    linear-gradient( 110deg, alpha(#444,0) 55%, #444 56%),
                    linear-gradient(-110deg, alpha(#444,0) 55%, #444 56%),
                    linear-gradient(150deg, #444 40%, alpha(#444,0) 41%),
                    radial-gradient(ellipse, bisque 5%,
                                             burlywood 6%, burlywood 10%,
                                             bisque 11%, bisque 15%,
                                             burlywood 16%, burlywood 20%,
                                             bisque 21%, bisque 25%,
                                             burlywood 26%, burlywood 30%,
                                             bisque 31%, bisque 35%,
                                             burlywood 36%, burlywood 40%,
                                             bisque 41%, bisque 45%,
                                             burlywood 46%, burlywood 50%,
                                             bisque 51%, bisque 55%,
                                             burlywood 56%, burlywood 60%,
                                             peru 61%, peru 65%,
                                             alpha(peru, 0) 66%),
                    linear-gradient(saddlebrown, saddlebrown),
                    linear-gradient(saddlebrown, saddlebrown),
                    linear-gradient(saddlebrown, saddlebrown),
                    linear-gradient(saddlebrown, saddlebrown),
                    radial-gradient(ellipse, sienna 65%, alpha(sienna, 0) 66%),
                    linear-gradient(sienna, sienna),
                    linear-gradient(110deg, alpha(sienna,0) 20%,
                                            sienna 21%,
                                            sienna 50%,
                                            alpha(sienna,0) 51%),
                    radial-gradient(ellipse, white(.5) 60%, white(0) 62%),
                    radial-gradient(ellipse, crimson 70%,
                                             alpha(crimson,0) 71%),
                    radial-gradient(ellipse, crimson 70%,
                                               alpha(crimson,0) 71%),
                    linear-gradient(sienna, sienna),
                    radial-gradient(ellipse, white(.5) 60%, white(0) 62%),
                    radial-gradient(ellipse, mediumseagreen 70%,
                                             alpha(mediumseagreen,0) 71%),
                    radial-gradient(ellipse, mediumseagreen 70%,
                                             alpha(mediumseagreen,0) 71%),
                    linear-gradient(sienna, sienna)
  background-size: 20em .6em,
                   3em 2em, 4em 3em,
                   10.5em 15.2em, 10.5em 15.2em, 10em 4em,
                   5em 8em,
                   8em .2em, 6em .2em, 4em .2em, 7.8em .2em,
                   5em 8em, 10.5em 7.4em, 4em 2em,
                   1em 2em, 3em 4em, 3em 4em,
                   .3em 1em,
                   1em 2em, 3em 4em, 3em 4em,
                   .3em 1em
  background-position: 0 15em,
                       8.5em 12.5em, 8em 12em,
                       0 0, 9.5em 0, 10em 0,
                       20em 2em,
                       25em 3.3em, 27.6em 4.5em, 26em 6.8em, 25.3em 8.5em,
                       30em 2em, 22.3em 2.3em, 25em .6em,
                       right 10.5em top 13.8em,
                       right 9em top 12.9em, right 7em top 12.9em, 
                       right 9.3em top 12.5em,
                       right 5em top 13.8em,
                       right 3.4em top 12.9em, right 1.3em top 12.9em, 
                       right 3.7em top 12.5em

  &:before
    width: 25em
    height: 5em
    bottom: 0
    right: 0
    background-color: peru
    background-repeat: no-repeat
    background-image: radial-gradient(ellipse at 50% 10%, burlywood 50%,
                                                          alpha(burlywood,0) 52%),
                      radial-gradient(ellipse at 50% 10%, burlywood 50%,
                                                          alpha(burlywood,0) 52%),
                      radial-gradient(ellipse at 50% 10%, burlywood 50%,
                                                          alpha(burlywood,0) 52%),
                      radial-gradient(ellipse at 50% 10%, burlywood 50%,
                                                          alpha(burlywood,0) 52%),
                      radial-gradient(ellipse at 50% 10%, burlywood 50%,
                                                          alpha(burlywood,0) 52%)
    background-size: 1.5em 3em
    background-position: 5em 0,
                         8.4em 0,
                         50% 0,
                         right 5em top 0,
                         right 8.4em top 0
    border-top-left-radius: 7em 5em
    border-top-right-radius: 7em 5em
    border-bottom-left-radius: 2em
    border-bottom-right-radius: 2em

  &:after
    width: 1em
    height: 1em
    left: 4em
    bottom: 2.4em
    background-color: grey
    border-top-left-radius: .5em .6em
    border-top-right-radius: .5em .6em
    border-bottom-left-radius: .3em
    border-bottom-right-radius: .3em
    box-shadow: -1em -2em 0 -.2em grey,
                -2em -1em 0 -.3em grey,
                -1em -1em 0 -.3em grey,
                 .2em -3em 0 -.2em grey,
                 2em -3em 0 -.3em grey,
                -2.5em -3.7em 0 -.3em grey,
                 1em -1.5em 0 -.1em grey,
                 2em -.3em 0 -.2em grey
!

JS 

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

Console