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HTML

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CSS

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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-.

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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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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 

              
                <main id="main"></main>
!

CSS 

              
                //// Global styles ////

:root {
    --animations-time: .4s;
    --icon-stroke-width: 8;
  
    --color-dark: hsl(240, 1%, 28%);
    --color-light: hsl(280, 43%, 99%);
    --color-brand: hsl(5, 65%, 50%);
    --color-brand-02: hsla(5, 65%, 50%, .2);
}

html {
  font-size: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  color: var(--color-dark);
}

body {
  background: var(--color-dark);
  display: flex;
  min-height: 100vh;
  padding: 0;
  margin: 0;
}

*, ::after, ::before {
  box-sizing: border-box;
}

main {
  background: var(--color-light);
  width: 360px;
  max-width: 100%;
  height: 640px;
  margin: auto;
}


//// Navigation ////

nav {
  max-height: 4rem;
  padding: .5rem;
  overflow: hidden;
}

ul {
  list-style: none;
  margin: 0;
  padding: 2rem;
  width: 100%;
  text-align: center;
  opacity: 0;
  transition: var(--animations-time);  
  
  li {
    font-size: 1.5rem;
    font-weight: 400;
    padding: 1.25rem 3rem;
  }
}


//// Icon ////

button {
  appearance: none;
  background: none;
  border: 0;
  padding: 0;
  border-radius: 50%;
  transition: var(--animations-time);  
  &:focus {
    outline: none;
    background: var(--color-brand-02);
  }
}

svg {
  width: 3rem;
  height: 3rem;
  display: block;
}

#middleBarCircle, #topLine, #bottomLine {
  stroke: var(--color-brand);
  stroke-width: var(--icon-stroke-width);
  transition: var(--animations-time);
  stroke-linecap: round;
}

#middleBarCircle{
  stroke-dashoffset: 0;
  stroke-dasharray: 112, 2000;
}


//// Open navigation state ////

nav.open {
  max-height: 100vh;

  #middleBarCircle {
    stroke-dasharray: 600, 2000;
    stroke-dashoffset: -270;
  }

  #topLine {
    transform: translate(65px, -10px) rotate(45deg);
  }

  #bottomLine {
    transform: translate(-64px, 64px) rotate(-45deg);
  }

  ul {
    opacity: 1;
  }
}
!

JS 

              
                const Navigation = ({ items }) => {
  const [isOpen, setIsOpen] = React.useState(false);
  return (
    <nav className={`${isOpen ? 'open' : ''}`}>
        <button onClick={() => setIsOpen(!isOpen)} aria-label="Menu">
          <svg id="icon" width="184" height="184" viewBox="0 0 184 184" fill="none" xmlns="http://www.w3.org/2000/svg">
            <g id="close">
              <path id="topLine" d="M36 54H148"/>
              <path id="bottomLine" d="M36 130H148"/>
            </g>
            <path id="middleBarCircle" d="M36 92H147.5C161 92 179.5 83.4 179.5 59C179.5 28.5 144 4 92 4C43.3989 4 4 43.3989 4 92C4 140.601 43.3989 180 92 180C140.601 180 180 140.601 180 92C180 43.3989 141.601 4 93 4"/>
          </svg>
        </button>
        <ul>
          {items.map(function(m, index) {
            return <li>{m}</li>;
          })}
        </ul>
      </nav>
  );
}
  
ReactDOM.render(
  <Navigation items={['Features', 'Services', 'About', 'Contact']} />,
  document.getElementById('main')
);
!
999px

Console