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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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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.

!
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).

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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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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

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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 

              
                <body class="align">

  <nav class="navigation">
    <ul class="navigation__list navigation__list--inline">
      <li>
        <a href="#">
          <svg class="icon icon--2x">
            <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#user" />
          </svg>
          <span class="invisible">Profile</span>
        </a>

        <ul class="navigation__list navigation__list--inline navigation__dropdown navigation__dropdown--right">

          <li>
            <a href="#" class="tooltip">
              <svg class="icon icon--2x">
                <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#facebook" />
              </svg>
              <span class="tooltip__body tooltip__body--top">Facebook</span>
            </a>
          </li>

          <li>
            <a href="#" class="tooltip">
              <svg class="icon icon--2x">
                <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#twitter" />
              </svg>
              <span class="tooltip__body tooltip__body--top">Twitter</span>
            </a>
          </li>

          <li>
            <a href="#" class="tooltip">
              <svg class="icon icon--2x">
                <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#google-plus" />
              </svg>
              <span class="tooltip__body tooltip__body--top">Google+</span>
            </a>
          </li>

          <li>
            <a href="#" class="tooltip">
              <svg class="icon icon--2x">
                <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#github" />
              </svg>
              <span class="tooltip__body tooltip__body--top">Github</span>
            </a>
          </li>

        </ul>
      </li>
    </ul>
  </nav>

  <svg xmlns="http://www.w3.org/2000/svg" class="icons">
    <symbol id="facebook" viewBox="0 0 1792 1792">
      <path d="M1343 12v264h-157q-86 0-116 36t-30 108v189h293l-39 296h-254v759H734V905H479V609h255V391q0-186 104-288.5T1115 0q147 0 228 12z" fill="#fff" />
    </symbol>
    <symbol id="github" viewBox="0 0 1792 1792">
      <path d="M896 128q209 0 385.5 103T1561 510.5 1664 896q0 251-146.5 451.5T1139 1625q-27 5-40-7t-13-30q0-3 .5-76.5t.5-134.5q0-97-52-142 57-6 102.5-18t94-39 81-66.5 53-105T1386 856q0-119-79-206 37-91-8-204-28-9-81 11t-92 44l-38 24q-93-26-192-26t-192 26q-16-11-42.5-27T578 459.5 493 446q-45 113-8 204-79 87-79 206 0 85 20.5 150t52.5 105 80.5 67 94 39 102.5 18q-39 36-49 103-21 10-45 15t-57 5-65.5-21.5T484 1274q-19-32-48.5-52t-49.5-24l-20-3q-21 0-29 4.5t-5 11.5 9 14 13 12l7 5q22 10 43.5 38t31.5 51l10 23q13 38 44 61.5t67 30 69.5 7 55.5-3.5l23-4q0 38 .5 88.5t.5 54.5q0 18-13 30t-40 7q-232-77-378.5-277.5T128 896q0-209 103-385.5T510.5 231 896 128zM419 1231q3-7-7-12-10-3-13 2-3 7 7 12 9 6 13-2zm31 34q7-5-2-16-10-9-16-3-7 5 2 16 10 10 16 3zm30 45q9-7 0-19-8-13-17-6-9 5 0 18t17 7zm42 42q8-8-4-19-12-12-20-3-9 8 4 19 12 12 20 3zm57 25q3-11-13-16-15-4-19 7t13 15q15 6 19-6zm63 5q0-13-17-11-16 0-16 11 0 13 17 11 16 0 16-11zm58-10q-2-11-18-9-16 3-14 15t18 8 14-14z" fill="#fff" />
    </symbol>
    <symbol id="google-plus" viewBox="0 0 2304 1792">
      <path d="M1437 913q0 208-87 370.5t-248 254-369 91.5q-149 0-285-58t-234-156-156-234T0 896t58-285 156-234 234-156 285-58q286 0 491 192l-199 191Q908 433 733 433q-123 0-227.5 62T340 663.5 279 896t61 232.5T505.5 1297t227.5 62q83 0 152.5-23t114.5-57.5 78.5-78.5 49-83 21.5-74H733V791h692q12 63 12 122zm867-122v210h-209v209h-210v-209h-209V791h209V582h210v209h209z" fill="#fff" />
    </symbol>
    <symbol id="twitter" viewBox="0 0 1792 1792">
      <path d="M1684 408q-67 98-162 167 1 14 1 42 0 130-38 259.5T1369.5 1125 1185 1335.5t-258 146-323 54.5q-271 0-496-145 35 4 78 4 225 0 401-138-105-2-188-64.5T285 1033q33 5 61 5 43 0 85-11-112-23-185.5-111.5T172 710v-4q68 38 146 41-66-44-105-115t-39-154q0-88 44-163 121 149 294.5 238.5T884 653q-8-38-8-74 0-134 94.5-228.5T1199 256q140 0 236 102 109-21 205-78-37 115-142 178 93-10 186-50z" fill="#fff" />
    </symbol>
    <symbol id="user" viewBox="0 0 1792 1792">
      <path d="M1536 1399q0 109-62.5 187t-150.5 78H469q-88 0-150.5-78T256 1399q0-85 8.5-160.5t31.5-152 58.5-131 94-89T583 832q131 128 313 128t313-128q76 0 134.5 34.5t94 89 58.5 131 31.5 152 8.5 160.5zm-256-887q0 159-112.5 271.5T896 896 624.5 783.5 512 512t112.5-271.5T896 128t271.5 112.5T1280 512z" fill="#fff" />
    </symbol>
  </svg>

</body>
!

CSS 

              
                @use postcss-preset-env {
  stage: 0;
}

/* helpers/accessibility.css */

.invisible {
  left: -999px;
  overflow: hidden;
  position: absolute;
  top: -999px;
}

/* helpers/align.css */

.align {
  display: grid;
  place-items: center;
}

/* layout/base.css */

:root {
  --html-font-size: 100%;

  --body-background-color: #434240;
}

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

html {
  box-sizing: border-box;
  font-size: var(--html-font-size);
}

body {
  background-color: var(--body-background-color);
  font-family: sans-serif;
  line-height: 1.5;
  margin: 0;
  min-block-size: 100vh;
}

/* modules/anchor.css */

a {
  outline: 0;
}

/* modules/icon.css */

:root {
  --icon-fill-color: #535152;
}

.icons {
  display: none;
}

.icon {
  display: inline-block;
  fill: var(--icon-fill-color);
  font-size: 1rem;
  height: 1em;
  vertical-align: middle;
  width: 1em;
}

.icon--2x {
  font-size: 2rem;
}

/* modules/image.css */

svg {
  height: auto;
  max-width: 100%;
  vertical-align: middle;
}

/* modules/navigation.css */

:root {
  --navigation-background-color: #f0f6ff;
  --navigation-border-radius: 0.25rem;

  --navigation-anchor-padding: 1.5rem;
  --navigation-anchor-text-decoration: none;
}

.navigation {
  background-color: #ff6462;
  color: #535152;
}

.navigation__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.navigation li {
  flex-shrink: 0;
  position: relative;
}

.navigation a {
  display: block;
  height: 80px;
  padding: 1.5rem;
  position: relative;
  text-decoration: none;
  width: 80px;
}

.navigation__dropdown {
  background-color: #535152;
  opacity: 0;
  position: absolute;
  transition: opacity 0.3s;
  visibility: hidden;
}

.navigation__dropdown--right {
  left: 100%;
  top: 0;
}

.navigation li:hover > .navigation__dropdown {
  opacity: 1;
  visibility: visible;
}

.navigation__list--inline {
  display: flex;
}

/* modules/tooltip.css */

.tooltip {
  position: relative;
}

.tooltip__body {
  background-color: #ff6462;
  border-radius: 0.33em;
  color: #373634;
  display: inline-block;
  font-size: 0.875em;
  opacity: 0;
  padding: 0.25em 0.75em;
  position: absolute;
  transition: opacity 0.5s, transform 0.3s;
  visibility: hidden;
}

.tooltip:focus .tooltip__body,
.tooltip:hover .tooltip__body {
  opacity: 1;
  transform: translate(-50%, 0);
  visibility: visible;
}

.tooltip__body--top {
  bottom: 100%;
  left: 50%;
  transform: translate(-50%, 100%);
}

.tooltip__body--top::after {
  border-left: 0.5em solid transparent;
  border-right: 0.5em solid transparent;
  border-top: 0.5em solid #ff6462;
  content: '';
  height: 0;
  left: 50%;
  position: absolute;
  top: 100%;
  transform: translateX(-50%);
  width: 0;
}
!

JS
!
999px

Console