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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

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).

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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

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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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.

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HTML 

              
                <div class="relative min-h-screen md:flex" data-dev-hint="container">
    <input type="checkbox" id="menu-open" class="hidden" />

    <label for="menu-open" class="absolute right-2 bottom-2 shadow-lg rounded-full p-2 bg-gray-100 text-gray-600 md:hidden" data-dev-hint="floating action button">
        <svg class="h-6 w-6" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor">
            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16M4 18h16" />
        </svg>
    </label>

    <header class="bg-gray-600 text-gray-100 flex justify-between md:hidden" data-dev-hint="mobile menu bar">
        <a href="#" class="block p-4 text-white font-bold whitespace-nowrap truncate">
            Your App is cool
        </a>

        <label for="menu-open" id="mobile-menu-button" class="m-2 p-2 focus:outline-none hover:text-white hover:bg-gray-700 rounded-md">
            <svg id="menu-open-icon" class="h-6 w-6 transition duration-200 ease-in-out" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16M4 18h16" />
            </svg>
            <svg id="menu-close-icon" class="h-6 w-6 transition duration-200 ease-in-out" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
            </svg>
        </label>
    </header>

    <aside id="sidebar" class="bg-gray-800 text-gray-100 md:w-64 w-3/4 space-y-6 pt-6 px-0 absolute inset-y-0 left-0 transform md:relative md:translate-x-0 transition duration-200 ease-in-out  md:flex md:flex-col md:justify-between overflow-y-auto" data-dev-hint="sidebar; px-0 for frameless; px-2 for visually inset the navigation">
        <div class="flex flex-col space-y-6" data-dev-hint="optional div for having an extra footer navigation">
            <a href="#" class="text-white flex items-center space-x-2 px-4" title="Your App is cool">
                <svg xmlns="http://www.w3.org/2000/svg" class="h-6 w-6 flex-0" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 3v4M3 5h4M6 17v4m-2-2h4m5-16l2.286 6.857L21 12l-5.714 2.143L13 21l-2.286-6.857L5 12l5.714-2.143L13 3z" />
                </svg>
                <span class="text-2xl font-extrabold whitespace-nowrap truncate">Your App is cool</span>
            </a>

            <nav data-dev-hint="main navigation">
                <a href="#" class="flex items-center space-x-2 py-2 px-4 transition duration-200 hover:bg-gray-700 hover:text-white">
                    <svg xmlns="http://www.w3.org/2000/svg" class="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                        <path d="M12 14l9-5-9-5-9 5 9 5z" />
                        <path d="M12 14l6.16-3.422a12.083 12.083 0 01.665 6.479A11.952 11.952 0 0012 20.055a11.952 11.952 0 00-6.824-2.998 12.078 12.078 0 01.665-6.479L12 14z" />
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 14l9-5-9-5-9 5 9 5zm0 0l6.16-3.422a12.083 12.083 0 01.665 6.479A11.952 11.952 0 0012 20.055a11.952 11.952 0 00-6.824-2.998 12.078 12.078 0 01.665-6.479L12 14zm-4 6v-7.5l4-2.222" />
                    </svg>
                    <span>About</span>
                </a>
                <a href="#" class="flex items-center space-x-2 py-2 px-4 transition duration-200 hover:bg-gray-700 hover:text-white">
                    <span class="ml-6">Without Icon</span>
                </a>
                <a href="#" class="flex items-center space-x-2 py-2 px-4 transition duration-200 hover:bg-gray-700 hover:text-white group">
                    <span class="w-4 h-4 flex-shrink-0 border border-gray-600 rounded group-hover:border-gray-400 transition duration-200"></span>
                    <span>Without Icon And a bit longer than usual</span>
                </a>
            </nav>
        </div>

        <nav data-dev-hint="second-main-navigation or footer navigation">
            <a href="#" class="block py-2 px-4 transition duration-200 hover:bg-gray-700 hover:text-white">
                asd
            </a>
            <a href="#" class="block py-2 px-4 transition duration-200 hover:bg-gray-700 hover:text-white">
                asd
            </a>
            <a href="#" class="block py-2 px-4 transition duration-200 hover:bg-gray-700 hover:text-white">
                asd
            </a>
        </nav>
    </aside>

    <main id="content" class="flex-1 p-6 lg:px-8">
        <div class="max-w-7xl mx-auto">
            <!-- Replace with your content -->
            <div class="px-4 py-6 sm:px-0">
                <div class="border-4 border-dashed border-gray-200 rounded-lg h-96"></div>
            </div>
            <!-- /End replace -->
        </div>
    </main>
</div>
!

CSS 

              
                #sidebar {
    --tw-translate-x: -100%;
}
#menu-close-icon {
    display: none;
}

#menu-open:checked ~ #sidebar {
    --tw-translate-x: 0;
}
#menu-open:checked ~ * #mobile-menu-button {
    background-color: rgba(31, 41, 55, var(--tw-bg-opacity));
}
#menu-open:checked ~ * #menu-open-icon {
    display: none;
}
#menu-open:checked ~ * #menu-close-icon {
    display: block;
}

@media (min-width: 768px) {
    #sidebar {
        --tw-translate-x: 0;
    }
}
!

JS
!
999px

Console