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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.

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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).

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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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="flex bg-gray-300 h-screen" x-data="{ isSidebarExpanded: true }">
  <aside class="flex flex-col text-gray-300 bg-gray-800 transition-all duration-300 ease-in-out" :class="isSidebarExpanded ? 'w-64' : 'w-20'">
    <a href="#" class="h-20 flex items-center px-4 bg-gray-900 hover:text-gray-100 hover:bg-opacity-50 focus:outline-none focus:text-gray-100 focus:bg-opacity-50 overflow-hidden">
      <svg viewBox="0 0 20 20" fill="currentColor" class="h-12 w-12 flex-shrink-0">
        <path d="M10.394 2.08a1 1 0 00-.788 0l-7 3a1 1 0 000 1.84L5.25 8.051a.999.999 0 01.356-.257l4-1.714a1 1 0 11.788 1.838L7.667 9.088l1.94.831a1 1 0 00.787 0l7-3a1 1 0 000-1.838l-7-3zM3.31 9.397L5 10.12v4.102a8.969 8.969 0 00-1.05-.174 1 1 0 01-.89-.89 11.115 11.115 0 01.25-3.762zM9.3 16.573A9.026 9.026 0 007 14.935v-3.957l1.818.78a3 3 0 002.364 0l5.508-2.361a11.026 11.026 0 01.25 3.762 1 1 0 01-.89.89 8.968 8.968 0 00-5.35 2.524 1 1 0 01-1.4 0zM6 18a1 1 0 001-1v-2.065a8.935 8.935 0 00-2-.712V17a1 1 0 001 1z" />
      </svg>
      <span class="ml-2 text-xl font-medium duration-300 ease-in-out" :class="isSidebarExpanded ? 'opacity-100' : 'opacity-0'">Dashboard</span>
    </a>
    <nav class="p-4 space-y-2 font-medium">
      <a href="#" class="flex items-center h-10 px-3 text-white bg-blue-600 rounded-lg transition-colors duration-150 ease-in-out focus:outline-none focus:shadow-outline">
        <svg viewBox="0 0 20 20" fill="currentColor" class="h-6 w-6 flex-shrink-0">
          <path d="M10.707 2.293a1 1 0 00-1.414 0l-7 7a1 1 0 001.414 1.414L4 10.414V17a1 1 0 001 1h2a1 1 0 001-1v-2a1 1 0 011-1h2a1 1 0 011 1v2a1 1 0 001 1h2a1 1 0 001-1v-6.586l.293.293a1 1 0 001.414-1.414l-7-7z" />
        </svg>
        <span class="ml-2 duration-300 ease-in-out" :class="isSidebarExpanded ? 'opacity-100' : 'opacity-0'">Home</span>
      </a>
      <a href="#" class="flex items-center h-10 px-3 hover:bg-blue-600 hover:bg-opacity-25 rounded-lg transition-colors duration-150 ease-in-out focus:outline-none focus:shadow-outline">
        <svg viewBox="0 0 20 20" fill="currentColor" class="h-6 w-6 flex-shrink-0">
          <path d="M13 6a3 3 0 11-6 0 3 3 0 016 0zM18 8a2 2 0 11-4 0 2 2 0 014 0zM14 15a4 4 0 00-8 0v3h8v-3zM6 8a2 2 0 11-4 0 2 2 0 014 0zM16 18v-3a5.972 5.972 0 00-.75-2.906A3.005 3.005 0 0119 15v3h-3zM4.75 12.094A5.973 5.973 0 004 15v3H1v-3a3 3 0 013.75-2.906z" />
        </svg>
        <span class="ml-2 duration-300 ease-in-out" :class="isSidebarExpanded ? 'opacity-100' : 'opacity-0'">Members</span>
      </a>
      <a href="#" class="flex items-center h-10 px-3 hover:bg-blue-600 hover:bg-opacity-25 rounded-lg transition-colors duration-150 ease-in-out focus:outline-none focus:shadow-outline">
        <svg viewBox="0 0 20 20" fill="currentColor" class="h-6 w-6 flex-shrink-0">
          <path fill-rule="evenodd" d="M6 2a2 2 0 00-2 2v12a2 2 0 002 2h8a2 2 0 002-2V7.414A2 2 0 0015.414 6L12 2.586A2 2 0 0010.586 2H6zm2 10a1 1 0 10-2 0v3a1 1 0 102 0v-3zm2-3a1 1 0 011 1v5a1 1 0 11-2 0v-5a1 1 0 011-1zm4-1a1 1 0 10-2 0v7a1 1 0 102 0V8z" clip-rule="evenodd" />
        </svg>
        <span class="ml-2 duration-300 ease-in-out" :class="isSidebarExpanded ? 'opacity-100' : 'opacity-0'">Reports</span>
      </a>
    </nav>
    <div class="border-t border-gray-700 p-4 font-medium mt-auto">
      <a href="#" class="flex items-center h-10 px-3 hover:text-gray-100 hover:bg-gray-600 hover:bg-opacity-25 rounded-lg transition-colors duration-150 ease-in-out focus:outline-none focus:shadow-outline">
        <svg viewBox="0 0 20 20" fill="currentColor" class="h-6 w-6 flex-shrink-0">
          <path fill-rule="evenodd" d="M11.49 3.17c-.38-1.56-2.6-1.56-2.98 0a1.532 1.532 0 01-2.286.948c-1.372-.836-2.942.734-2.106 2.106.54.886.061 2.042-.947 2.287-1.561.379-1.561 2.6 0 2.978a1.532 1.532 0 01.947 2.287c-.836 1.372.734 2.942 2.106 2.106a1.532 1.532 0 012.287.947c.379 1.561 2.6 1.561 2.978 0a1.533 1.533 0 012.287-.947c1.372.836 2.942-.734 2.106-2.106a1.533 1.533 0 01.947-2.287c1.561-.379 1.561-2.6 0-2.978a1.532 1.532 0 01-.947-2.287c.836-1.372-.734-2.942-2.106-2.106a1.532 1.532 0 01-2.287-.947zM10 13a3 3 0 100-6 3 3 0 000 6z" clip-rule="evenodd" />
        </svg>
        <span class="ml-2 duration-300 ease-in-out" :class="isSidebarExpanded ? 'opacity-100' : 'opacity-0'">Settings</span>
      </a>
    </div>
  </aside>
  <div class="flex-1 flex flex-col">
    <header class="h-20 flex items-center px-6 bg-white">
      <button class="p-2 -ml-2 mr-2" @click="isSidebarExpanded = !isSidebarExpanded">
        <svg viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round" class="h-6 w-6 transform" :class="isSidebarExpanded ? 'rotate-180' : 'rotate-0'">
          <path stroke="none" d="M0 0h24v24H0z" fill="none"/>
          <line x1="4" y1="6" x2="14" y2="6" />
          <line x1="4" y1="18" x2="14" y2="18" />
          <path d="M4 12h17l-3 -3m0 6l3 -3" />
        </svg>
      </button>
      <span class="font-medium">Header</span>
    </header>
    <main class="flex-1 p-6">
      <p class="font-medium">Click on the menu button on top to expand/shrink the sidebar</p>
    </main>
  </div>
</div>
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