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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

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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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Packages

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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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HTML 

              
                <div class="fall" role="img" aria-label="cartoon representing fall"></div>
!

CSS 

              
                div {
  width: 90vmin;
  aspect-ratio: 4 / 3;
  position: relative;
  background:
    /* clouds */
    /* cloud 1 */
    radial-gradient(farthest-side at 60% 100%, #fff 60%, #0000 0) 50% 28% / 30% 5%,
    radial-gradient(farthest-side at 50% 70%, #fff 60%, #0000 0) 50% 22% / 13% 12%,
    radial-gradient(farthest-side at 60% 100%, #fff 60%, #0000 0) 53% 25% / 10% 8%,
    /* cloud 2 */
    radial-gradient(farthest-side at 60% 100%, #eed 60%, #0000 0) 58% 28% / 30% 3%,
    radial-gradient(farthest-side at 50% 70%, #eed 30%, #0000 0) 58% 23% / 17% 10%,
    radial-gradient(farthest-side at 60% 100%, #eed 60%, #0000 0) 61% 23% / 10% 8%,
     /* cloud 3*/
     radial-gradient(farthest-side at 60% 100%, #ddc 60%, #0000 0) 12% 18% / 30% 4%,
    radial-gradient(farthest-side at 50% 70%, #ddc 30%, #0000 0) 23% 11% / 13% 13%,
    radial-gradient(farthest-side at 60% 100%, #ddc 60%, #0000 0) 18% 14% / 10% 8%,
    /* sun */
    radial-gradient(circle, #fff 10%, #ffe 15%, #ffec 16%, #ffe5 0, #ffe0 25%),
    /* base */
    linear-gradient(#b8bfa0, #fde5aa 60%)
    ;
  background-repeat: no-repeat;
  
  &::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
     /* mountains */
    /* level 2 */
      radial-gradient(200% 70% at 0 0, #0000 99%, #cdd9c1 0) 0 0 / calc(20% + 0.5px) 100% no-repeat,
    radial-gradient(139% 90% at 100% 0, #0000 98%, #cdd9c1 0) 100% 0 / calc(80% + 0.5px) 100% no-repeat,
    conic-gradient(at 75% 58%, #0000 120deg, #cdd9c1 0 250deg, #0000 0),
     /* trees */
      /* TBD */
    /* level 3 */
      radial-gradient(circle at 35% 30%, #f8f7f3 23%, #0000 0),
      #e7e2cf;
    background-repeat: no-repeat;
    -webkit-mask:
      radial-gradient(200% 70% at 0 0, #0000 99%, #fff 0 99.9%, #e7e2cf 0) 0 0 / calc(30% + 0.5px) 85% no-repeat,
    radial-gradient(157% 80% at 100% 0, #0000 98%, #fff 0 99%, #e7e2cf 0) 100% 0 / calc(70% + 0.5px) 85% no-repeat,
       conic-gradient(at 75% 58%, #0000 120deg, #cdd9c1 0 250deg, #0000 0),
      linear-gradient(#0000 70%, #000 0);
  }
  
  &::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
      /* tree 1 */
      radial-gradient(farthest-side at 140% 100%, #0000 80%, #6d3f08 0 99%, #0000 0) 100% 20% / 5% 20%,
      radial-gradient(farthest-side at 0% 140%, #0000 80%, #6d3f08 0 99%, #0000 0) 76.5% 25% / 11% 6%,
      conic-gradient(at -15% 30%, #0000 128deg, #6d3f08 0 139deg, #0000 0) 97% -10% / 30% 50%,
      conic-gradient(at 50% -300%, #0000 175deg, #6d3f08 0 178deg, #0000 0) 101% 0 / 50% 100%,
      radial-gradient(at 75% 15%, #ec8a06 17%, #0000 0),
      radial-gradient(at 100% 0%, #ec8a06 10%, #0000 0),
      radial-gradient(50% 100% at 90% 25%, #ec8a06 30%, #0000 0),
      radial-gradient(100% 100% at 63% 5%, #ec8a06 10%, #0000 0),
      radial-gradient(100% 100% at 80% 35%, #ec8a06 15%, #0000 0),
      radial-gradient(100% 100% at 61% 5%, #fcaa26 10%, #0000 0),
      radial-gradient(at 71% 15%, #fcaa26 17%, #0000 0),
      radial-gradient(100% 100% at 78% 37%, #fcaa26 15%, #0000 0),
      radial-gradient(50% 100% at 90% 25%, #ec8a06 30%, #fcaa26 0 35%, #0000 0),
      /* tree 2 */
      radial-gradient(50% 200% at -20% 50%, #0000 50%, #b98733 0 58%, #0000 0) 30% 62% / 30% 30%,
      radial-gradient(55% 200% at 100% 50%, #0000 50%, #b98733 0 56%, #0000 0) 3% 58% / 30% 36%,
      radial-gradient(farthest-side at 100% 100%, #0000 90%, #b98733 0 99%, #0000 0) 24% 50% / 5% 10%,
      radial-gradient(30% 200% at 50% 100%, #b98733 50%, #0000 0) 20% 71% / 11% 10%,
      radial-gradient(at 24% 45%, #fad06e 12%, #0000 0),
      radial-gradient(circle at 21% 38%, #fad06e 9%, #0000 0),
       radial-gradient(circle at 30% 35%, #fad06e 7%, #0000 0),
       radial-gradient(50% 80% at 24% 30%, #fad06e 12%, #0000 0),
      radial-gradient(at 22% 46%, #dfc05e 12%, #0000 0),
      radial-gradient(circle at 20% 37%, #dfc05e 9%, #0000 0),
      radial-gradient(50% 80% at 23% 29%, #dfc05e 12%, #0000 0),
      radial-gradient(at 25.5% 45%, #ffe07e 12%, #0000 0),
      radial-gradient(circle at 31.4% 34%, #ffe07e 7%, #0000 0),
      radial-gradient(50% 80% at 25% 30%, #ffe07e 12%, #0000 0),
      /* tree 3 */
      radial-gradient(50% 200% at -20% 50%, #0000 50%, #7d3500 0 58%, #0000 0) 10% 62% / 30% 30%,
      radial-gradient(55% 200% at 100% 50%, #0000 50%, #7d3500 0 56%, #0000 0) -18% 64% / 30% 26%,
      radial-gradient(farthest-side at 0% 100%, #0000 90%, #7d3500 0 99%, #0000 0) 5% 55% / 4% 9%,
      radial-gradient(at 10% 55%, #b24a00 5%, #0000 0),
      radial-gradient(circle at 10% 55%, #b24a00 5%, #0000 0),
      radial-gradient(circle at 10% 37%, #b24a00 7%, #0000 0),
      radial-gradient(50% 100% at 4% 45%, #b24a00 15%, #0000 0),
      /* mountains */
      /* level 3 */
      radial-gradient(70% 50% at -25% 111%, #b65401 80%, #0000 0),
      radial-gradient(127% 80% at 100% 0, #0000 98%, #b65401 0) 100% 100% / 90% 35% no-repeat,
      /* level 2*/
      radial-gradient(120% 50% at 105% 111%, #ef9e21 80%, #0000 0),
      /* level 1 */
      radial-gradient(240% 80% at 30% 0, #0000 99%, #f9c84a 0) 0 0 / calc(35% + 0.5px) 90% no-repeat,
    radial-gradient(205% 80% at 100% 0, #0000 98%, #f9c84a 0) 100% 0 / calc(65% + 0.5px) 100% no-repeat
      ;
    background-repeat: no-repeat;
  }
}
!

JS
!
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