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HTML

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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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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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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

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JavaScript

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HTML 

              
                    <div class="cursor"></div>

    <div class="container">
      <div class="close"></div>
      <div class="min"></div>
      <div class="max"></div>
      <div class="navigation">
        <a class="link">
          <svg
            xmlns="http://www.w3.org/2000/svg"
            viewbox="0 0 64 64"
            width="24px"
            height="24px"
          >
            <rect
              x="4"
              y="34"
              class="stroke-only move-right"
              width="16"
              height="16"
            />
            <rect
              x="24"
              y="34"
              class="stroke-only move-right"
              width="16"
              height="16"
            />
            <rect
              x="24"
              y="14"
              class="stroke-only move-left"
              width="16"
              height="16"
            />
            <rect
              x="44"
              y="14"
              class="stroke-only move-left"
              width="16"
              height="16"
            />
          </svg>
        </a>
        <a class="link">
          <svg
            xmlns="http://www.w3.org/2000/svg"
            viewbox="-4 0 60 64"
            width="28px"
            height="24px"
          >
            <path
              class="stroke-only svg-search turn-90"
              d="M43.17,43.17c0.97-0.97,1.82-2.01,2.54-3.11l11.6,11.6l-5.66,5.66l-11.6-11.6
        		C41.16,44.99,42.2,44.14,43.17,43.17z"
            />
            <path
              class="stroke-only svg-search turn-90"
              d="M40.83,12.54c6.84,6.84,7.69,17.41,2.54,25.17c-0.73,1.1-1.58,2.14-2.54,3.11s-2.01,1.82-3.11,2.54
        		c-7.77,5.14-18.33,4.3-25.17-2.54c-7.81-7.81-7.81-20.47,0-28.28S33.02,4.73,40.83,12.54z"
            />
          </svg>
        </a>
        <a class="link margin-left-auto">
          <svg
            xmlns="http://www.w3.org/2000/svg"
            viewbox="0 0 64 64"
            width="24px"
            height="24px"
          >
            <path
              class="stroke-only transform-center-center turn-15"
              d="M32,59c3.31,0,6-2.69,6-6H26C26,56.31,28.69,59,32,59z"
            />
            <path
              class="stroke-only transform-center-center turn-15"
              d="M48,36.06V25c0-7.47-5.13-13.73-12.05-15.49C34.68,9.19,33.37,9,32,9s-2.68,0.19-3.95,0.51
          		C21.13,11.27,16,17.53,16,25v11.06c0,5.48-3.1,10.49-8,12.94h16h16h16C51.1,46.55,48,41.54,48,36.06z"
            />
            <line
              class="stroke-only transform-center-center turn-15"
              x1="32"
              y1="5"
              x2="32"
              y2="9"
            />
          </svg>
        </a>
        <a class="link">
          <svg
            xmlns="http://www.w3.org/2000/svg"
            viewbox="0 0 64 64"
            width="24px"
            height="28px"
          >
            <path
              class="stroke-only"
              d="M36,44c0,2.21-1.79,4-4,4s-4-1.79-4-4H4v16h56V44H36z"
            />
            <path
              class="stroke-only"
              d="M29,12H12L4,44h24c0,2.21,1.79,4,4,4s4-1.79,4-4h24l-8-32H35"
            />
            <line
              class="stroke-only move-up-medium"
              x1="32"
              y1="4"
              x2="32"
              y2="36"
            />
            <polyline
              class="stroke-only move-up-medium"
              points="26,30 32,36 38,30 	"
            />
          </svg>
        </a>
        <a class="link">
          <svg
            xmlns="http://www.w3.org/2000/svg"
            viewbox="0 0 64 64"
            width="24px"
            height="28px"
          >
            <path
              class="stroke-only"
              d="M32,32C16.54,32,4,44.54,4,60h56C60,44.54,47.46,32,32,32z"
            />
            <circle
              class="stroke-only transform-center-center move-up-little"
              cx="32"
              cy="16"
              r="12"
            />
          </svg>
        </a>
        <a class="link">
          <svg
            xmlns="http://www.w3.org/2000/svg"
            viewbox="0 0 64 64"
            width="24px"
            height="24px"
          >
            <rect x="4" y="16" class="stroke-only" width="56" height="32" />
            <line class="stroke-only" x1="16" y1="20" x2="16" y2="44" />
            <line class="stroke-only" x1="32" y1="20" x2="32" y2="44" />
            <line class="stroke-only" x1="48" y1="20" x2="48" y2="44" />
            <circle class="stroke-only move-down" cx="16" cy="24" r="2" />
            <circle class="stroke-only move-up" cx="32" cy="40" r="2" />
            <circle class="stroke-only move-down" cx="48" cy="24" r="2" />
          </svg>
        </a>
      </div>

      <div class="content">
        <h1>Hipster Ipsum<small> (hover icons and links)</small></h1>
        <p>
          Tbh venmo scenester, cloud bread sustainable lyft blue bottle.
          Truffaut <button class="btn">tacos</button> fam poutine selvage plaid
          lyft polaroid, <button class="btn">lo-fi</button> small batch. Bespoke
          godard wayfarers affogato green juice irony fam snackwave selvage ugh
          tumblr food truck VHS af. Selvage raw denim man braid migas pickled,
          subway tile leggings flexitarian PBR&B. Squid sriracha occupy godard
          plaid artisan fingerstache bushwick venmo locavore letterpress
          organic.
        </p>
        <p>
          Try-hard schlitz asymmetrical snackwave cornhole paleo. Pok pok
          raclette fam beard aesthetic XOXO keytar gluten-free
          <button class="btn">8-bit</button> mumblecore yr distillery skateboard
          tumblr put a bird on it. Meditation pour-over single-origin coffee
          master cleanse leggings,
          <button class="btn">four loko</button> typewriter. Leggings hot
          chicken edison bulb bushwick VHS health goth coloring book, vice
          kinfolk twee pitchfork succulents locavore before they sold out
          fingerstache. Forage cornhole try-hard flexitarian chillwave
          <button class="btn">craft beer</button>
          <button class="btn">la croix</button> tote bag. Activated charcoal
          cardigan celiac <button class="btn">messenger bag</button> biodiesel
          mixtape. Gochujang glossier beard tumblr gluten-free.
        </p>
        <p>
          Snackwave affogato humblebrag chia microdosing you probably haven't
          heard of them kickstarter photo booth ennui kale chips cliche austin
          poke chillwave venmo. <button class="btn">La croix</button> kombucha
          slow-carb vegan actually pitchfork cold-pressed fanny pack crucifix
          salvia brooklyn church-key disrupt. Viral brooklyn thundercats
          vaporware wayfarers, artisan mumblecore. Fingerstache raw denim
          biodiesel vape kitsch hot chicken cloud bread. Yuccie mumblecore
          dreamcatcher next level poutine. Skateboard humblebrag glossier
          distillery photo booth cornhole scenester meditation single-origin
          coffee authentic vinyl fixie copper mug shaman.
        </p>
      </div>
    </div>
!

CSS 

              
                html {
  background: #222831;
  color: #eee;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
  Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji',
  'Segoe UI Symbol';
  font-size: 0.875rem;
  line-height: 1.375rem;
  cursor: url("data:image/svg+xml,%3Csvg height='6' width='6' viewBox='0 0 8 8' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='4' cy='4' fill='%23eee' r='4'/%3E%3C/svg%3E") 3 3, auto;
}

.stroke-only {
  fill: none;
  stroke: #eee;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: 600ms transform cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
.transform-center-center {
  transform-origin: center center;
}
a.link:hover .stroke-only {
  stroke: #b55400;
}
a.link:hover .move-up {
  transform: translateY(-16px);
}
a.link:hover .move-right {
  transform: translateX(10px);
}
a.link:hover .move-down {
  transform: translateY(16px);
}
a.link:hover .move-left {
  transform: translateX(-10px);
}
a.link:hover .move-up-little {
  transform: translateY(-4px);
}
a.link:hover .move-up-medium {
  transform: translateY(-6px);
}
.svg-search {
  transform-origin: 26px 26px;
}
a.link:hover .turn-90 {
  transform: rotate(90deg);
}
a.link:hover .turn-15 {
  transform: rotate(15deg);
}

.container {
  position: relative;
  max-width: auto;
  margin: auto;
  margin-top: 4rem;
  padding: 1rem;
  border: 1px solid #393e46;
  border-radius: 0.25rem;
}
@media (min-width: 576px) {
  .container {
    max-width: 540px;
  }
}
@media (min-width: 768px) {
  .container {
    max-width: 720px;
  }
}
@media (min-width: 992px) {
  .container {
    max-width: 960px;
  }
}
@media (min-width: 1200px) {
  .container {
    max-width: 1140px;
  }
}

.close, .min, .max {
  position: absolute;
  top: 1rem;
  width: 0.75rem;
  height: 0.75rem;
  background-color: #393e46;
  border-radius: 50%;
}
.close {
  left: 1rem;
  background-color: #b55400;
}
.min {
  left: 2.5rem;
}
.max {
  left: 4rem;
}

.navigation {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  align-content: center;
  margin-top: 1.75rem;
  padding: 0.125rem 0;
}

.margin-left-auto {
  margin-left: auto;
}

.content {
  padding: 1rem;
}
.content h1 {
  line-height: 1;
  margin-top: 0;
}
.content p {
  line-height: 2;
}

.cursor {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: var(--width);
  height: var(--height);
  transform: translate(calc(var(--x) - var(--width) / 2), calc(var(--y) - var(--height) / 2));
  /* transition-duration: 125ms;
  transition-timing-function: cubic-bezier(0.39, 0.575, 0.565, 1);
  transition-property: width, height, transform; */
  transition: 150ms width cubic-bezier(0.39, 0.575, 0.565, 1),
              150ms height cubic-bezier(0.39, 0.575, 0.565, 1),
              150ms transform cubic-bezier(0.39, 0.575, 0.565, 1);
  z-index: 1;
  pointer-events: none;
  will-change: transform;
}
@media (pointer: fine) {
  .cursor {
    display: block;
  }
}
.cursor::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: var(--radius);
  border: 2px solid #b55400;
  opacity: var(--scale);
  -webkit-transform: scale(var(--scale));
          transform: scale(var(--scale));
  transition: 300ms opacity cubic-bezier(0.39, 0.575, 0.565, 1),
              300ms transform cubic-bezier(0.39, 0.575, 0.565, 1),
              150ms border-radius cubic-bezier(0.39, 0.575, 0.565, 1);
}

html:not(html:hover) .cursor::after {
  opacity: 0;
  transform: scale(0);
}

.link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background: none;
  border-radius: 50%;
}

.btn {
  appearance: none;
  border: none;
  color: #eee;
  font-size: 1rem;
  line-height: 1.5rem;
  cursor: inherit;
  margin: -0.125rem -0.375rem;
  padding: 0.125rem 0.375rem;
  background: none;
  border-radius: 0.25rem;
  text-decoration-line: underline;
  text-decoration-style: dotted;
}
.btn:hover {
  text-decoration-line: none;
}
!

JS 

              
                const updateProperties = (elem, state) => {
  elem.style.setProperty('--x', `${state.x}px`)
  elem.style.setProperty('--y', `${state.y}px`)
  elem.style.setProperty('--width', `${state.width}px`)
  elem.style.setProperty('--height', `${state.height}px`)
  elem.style.setProperty('--radius', state.radius)
  elem.style.setProperty('--scale', state.scale)
}

document.querySelectorAll('.cursor').forEach(cursor => {
  let onElement

  const createState = e => {
    const defaultState = {
      x: e.clientX,
      y: e.clientY,
      width: 40,
      height: 40,
      radius: '50%'
    }

    const computedState = {}

    if (onElement != null) {
      const { top, left, width, height } = onElement.getBoundingClientRect()
      const radius = window.getComputedStyle(onElement).borderTopLeftRadius

      computedState.x = left + width / 2
      computedState.y = top + height / 2
      computedState.width = width
      computedState.height = height
      computedState.radius = radius
    }

    return {
      ...defaultState,
      ...computedState
    }
  }

  document.addEventListener('mousemove', e => {
    const state = createState(e)
    updateProperties(cursor, state)
  })

  document.querySelectorAll('a, button').forEach(elem => {
    elem.addEventListener('mouseenter', () => (onElement = elem))
    elem.addEventListener('mouseleave', () => (onElement = undefined))
  })
})
!
999px

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