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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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

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

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

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About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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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 esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

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

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

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HTML 

              
                <div class="antialiased bg-gray-200 min-h-screen p-8">
  <div class="flex justify-center">
    <nav id="nav" class="w-56 relative">
      <span
        class="absolute h-10 w-full bg-white rounded-lg shadow ease-out transition-transform transition-medium"
        :style="{ transform: `translateY(calc(100% * ${selected}))` }"
      ></span>
      <ul class="relative">
        <li>
          <button
            type="button"
            @click="select(0)"
            :aria-selected="selected === 0"
            class="py-2 px-3 w-full flex items-center focus:outline-none focus-visible:underline"
          >
            <svg
              :class="selected === 0 ? 'text-indigo-400' : 'text-gray-500'"
              class="h-6 w-6 transition-all ease-out transition-medium"
              viewBox="0 0 24 24"
              fill="currentColor"
            >
              <path
                fill-rule="evenodd"
                clip-rule="evenodd"
                d="M12.707 2.293a1 1 0 00-1.414 0l-9 9a1 1 0 101.414 1.414L4 12.414V21a1 1 0 001 1h5a1 1 0 001-1v-6h2v6a1 1 0 001 1h5a1 1 0 001-1v-8.586l.293.293a1 1 0 001.414-1.414l-9-9zM18 10.414l-6-6-6 6V20h3v-6a1 1 0 011-1h4a1 1 0 011 1v6h3v-9.586z"
              />
            </svg>
            <span
              :class="selected === 0 ? 'text-indigo-600' : 'text-gray-700'"
              class="ml-2 text-sm font-medium transition-all ease-out transition-medium"
            >
              Home
            </span>
          </button>
        </li>
        <li>
          <button
            type="button"
            @click="select(1)"
            :aria-selected="selected === 1"
            class="py-2 px-3 w-full flex items-center focus:outline-none focus-visible:underline"
          >
            <svg
              :class="selected === 1 ? 'text-indigo-400' : 'text-gray-500'"
              class="h-6 w-6 transition-all ease-out transition-medium"
              viewBox="0 0 24 24"
              fill="currentColor"
            >
              <path
                fill-rule="evenodd"
                clip-rule="evenodd"
                d="M11.617 1.076a1 1 0 011.09.217l5.657 5.657a9 9 0 11-13.113.41A1 1 0 017 8.022v2.292a2 2 0 104 0V2a1 1 0 01.617-.924zM13 4.414v5.9A4 4 0 015.212 11.6 7 7 0 1016.95 8.364L13 4.414z"
              />
            </svg>
            <span
              :class="selected === 1 ? 'text-indigo-600' : 'text-gray-700'"
              class="ml-2 text-sm font-medium transition-all ease-out transition-medium"
            >
              Popular
            </span>
          </button>
        </li>
        <li>
          <button
            type="button"
            @click="select(2)"
            :aria-selected="selected === 2"
            class="py-2 px-3 w-full flex items-center focus:outline-none focus-visible:underline"
          >
            <svg
              :class="selected === 2 ? 'text-indigo-400' : 'text-gray-500'"
              class="h-6 w-6 transition-all ease-out transition-medium"
              viewBox="0 0 24 24"
              fill="currentColor"
            >
              <path
                fill-rule="evenodd"
                clip-rule="evenodd"
                d="M12 7a1 1 0 011-1h8a1 1 0 011 1v8a1 1 0 11-2 0V8h-7a1 1 0 01-1-1z"
              />
              <path
                fill-rule="evenodd"
                clip-rule="evenodd"
                d="M20.707 7.293a1 1 0 010 1.414l-7 7a1 1 0 01-1.414 0L9 12.414l-5.293 5.293a1 1 0 01-1.414-1.414l6-6a1 1 0 011.414 0L13 13.586l6.293-6.293a1 1 0 011.414 0z"
              />
            </svg>
            <span
              :class="selected === 2 ? 'text-indigo-600' : 'text-gray-700'"
              class="ml-2 text-sm font-medium transition-all ease-out transition-medium"
            >
              Trending
            </span>
          </button>
        </li>
        <li>
          <button
            type="button"
            @click="select(3)"
            :aria-selected="selected === 3"
            class="py-2 px-3 w-full flex items-center focus:outline-none focus-visible:underline"
          >
            <svg
              :class="selected === 3 ? 'text-indigo-400' : 'text-gray-500'"
              class="h-6 w-6 transition-all ease-out transition-medium"
              viewBox="0 0 24 24"
              fill="currentColor"
            >
              <path
                fill-rule="evenodd"
                clip-rule="evenodd"
                d="M7 10a3 3 0 013-3h8a3 3 0 013 3v8a3 3 0 01-3 3h-8a3 3 0 01-3-3v-8zm3-1a1 1 0 00-1 1v8a1 1 0 001 1h8a1 1 0 001-1v-8a1 1 0 00-1-1h-8z"
              />
              <path
                fill-rule="evenodd"
                clip-rule="evenodd"
                d="M3 6a3 3 0 013-3h10a1 1 0 110 2H6a1 1 0 00-1 1v10a1 1 0 11-2 0V6z"
              />
            </svg>
            <span
              :class="selected === 3 ? 'text-indigo-600' : 'text-gray-700'"
              class="ml-2 text-sm font-medium transition-all ease-out transition-medium"
            >
              Subscriptions
            </span>
          </button>
        </li>
        <li>
          <button
            type="button"
            @click="select(4)"
            :aria-selected="selected === 4"
            class="py-2 px-3 w-full flex items-center focus:outline-none focus-visible:underline"
          >
            <svg
              :class="selected === 4 ? 'text-indigo-400' : 'text-gray-500'"
              class="h-6 w-6 transition-all ease-out transition-medium"
              viewBox="0 0 24 24"
              fill="currentColor"
            >
              <path
                fill-rule="evenodd"
                clip-rule="evenodd"
                d="M4 5a3 3 0 013-3h10a3 3 0 013 3v16a1 1 0 01-1.447.894L12 18.618l-6.553 3.276A1 1 0 014 21V5zm3-1a1 1 0 00-1 1v14.382l5.553-2.776a1 1 0 01.894 0L18 19.382V5a1 1 0 00-1-1H7z"
              />
            </svg>
            <span
              :class="selected === 4 ? 'text-indigo-600' : 'text-gray-700'"
              class="ml-2 text-sm font-medium transition-all ease-out transition-medium"
            >
              Bookmarks
            </span>
          </button>
        </li>
        <li>
          <button
            type="button"
            @click="select(5)"
            :aria-selected="selected === 5"
            class="py-2 px-3 w-full flex items-center focus:outline-none focus-visible:underline"
          >
            <svg
              :class="selected === 5 ? 'text-indigo-400' : 'text-gray-500'"
              class="h-6 w-6 transition-all ease-out transition-medium"
              viewBox="0 0 24 24"
              fill="currentColor"
            >
              <path
                fill-rule="evenodd"
                clip-rule="evenodd"
                d="M13 11.586l2.536 2.535a1 1 0 11-1.415 1.415l-2.828-2.829A.997.997 0 0111 12V8a1 1 0 112 0v3.586z"
              />
              <path
                fill-rule="evenodd"
                clip-rule="evenodd"
                d="M5 1a1 1 0 011 1v1.998c3.918-2.945 9.506-2.635 13.071.93 3.905 3.906 3.905 10.238 0 14.143-3.905 3.905-10.237 3.905-14.142 0A9.972 9.972 0 012 12a1 1 0 112 0 8 8 0 101.777-5.029A1 1 0 014 6.341V2a1 1 0 011-1z"
              />
              <path
                fill-rule="evenodd"
                clip-rule="evenodd"
                d="M11.293 12.707A.997.997 0 0111 12V8a1 1 0 112 0v3.586l2.536 2.535a1 1 0 11-1.415 1.415l-2.828-2.829zM5.934 1.643A1 1 0 004 2v4.342a1 1 0 001.777.63A8 8 0 114 12v-.001a1 1 0 10-2 0c0 2.558.977 5.119 2.929 7.071 3.905 3.905 10.237 3.905 14.142 0 3.844-3.844 3.904-10.04.18-13.957A10.004 10.004 0 006 3.999V2a.998.998 0 00-.066-.357zM5 2.25z"
              />
            </svg>
            <span
              :class="selected === 5 ? 'text-indigo-600' : 'text-gray-700'"
              class="ml-2 text-sm font-medium transition-all ease-out transition-medium"
            >
              History
            </span>
          </button>
        </li>
      </ul>
    </nav>
  </div>
</div>
!

CSS 

              
                .ease-in {
  transition-timing-function: cubic-bezier(0.4, 0, 1, 1);
}
.ease-out {
  transition-timing-function: cubic-bezier(0, 0, 0.2, 1);
}
.ease-in-out {
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

.transition-fastest {
  transition-duration: 75ms;
}
.transition-faster {
  transition-duration: 100ms;
}
.transition-fast {
  transition-duration: 150ms;
}
.transition-medium {
  transition-duration: 200ms;
}
.transition-slow {
  transition-duration: 300ms;
}
.transition-slower {
  transition-duration: 500ms;
}
.transition-slowest {
  transition-duration: 700ms;
}

.transition-all {
  transition-property: all;
}
.transition-opacity {
  transition-property: opacity;
}
.transition-transform {
  transition-property: transform;
}

.focus-visible.focus-visible\:underline {
  text-decoration: underline;
}
!

JS 

              
                new Vue({
  el: "#nav",
  data: {
    selected: 1
  },
  methods: {
    select(i) {
      this.selected = i;
    }
  }
});
!
999px

Console