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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).

Add External Stylesheets/Pens

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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

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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.

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HTML 

              
                
<ul class="m-d expand-list">
	<li data-md-content="200">
		<label name="tab" for="tab1" tabindex="-1" class="tab_lab" role="tab">Product Description</label>
		<input type="checkbox" checked class="tab" id="tab1" tabindex="0" />
		<span class="open-close-icon">
			<i class="fas fa-plus"></i>
			<i class="fas fa-minus"></i>
		</span>
		<div class="content">
            Welcome to Brackets, a modern open-source code editor that understands web design. It's a lightweight,
            yet powerful, code editor that blends visual tools into the editor so you get the right amount of help
            when you want it.
        </div>
    </li>
    <li data-md-content="300">
			<label name="tab" for="tab2" tabindex="-1" class="tab_lab" role="tab">Specifications</label>
			<input type="checkbox" class="tab" id="tab2" tabindex="0" />
			<span class="open-close-icon"><i class="fas fa-plus"></i><i class="fas fa-minus"></i></span>
			<div class="content">
				<em>Brackets is a different type of editor.</em>
            Brackets has some unique features like Quick Edit, Live Preview and others that you may not find in other
            editors. Brackets is written in JavaScript, HTML and CSS. That means that most of you using Brackets
            have the skills necessary to modify and extend the editor. In fact, we use Brackets every day to build
            Brackets. To learn more about how to use the key features, read on.
        </div>
    </li>
    <li data-md-content="600">
			<label name="tab" for="tab3" tabindex="-1" class="tab_lab" role="tab">Shipping &amp; Returns</label>
			<input type="checkbox" class="tab" id="tab3" tabindex="0" />
			<span class="open-close-icon"><i class="fas fa-plus"></i><i class="fas fa-minus"></i></span>
      <div class="content">
				<h3>Projects in Brackets</h3>
        <p>
            In order to edit your own code using Brackets, you can just open the folder containing your files.
            Brackets treats the currently open folder as a "project"; features like Code Hints, Live Preview and
            Quick Edit only use files within the currently open folder.
        </p>
        <samp>
            Once you're ready to get out of this sample project and edit your own code, you can use the dropdown
            in the left sidebar to switch folders. Right now, the dropdown says "Getting Started" - that's the
            folder containing the file you're looking at right now. Click on the dropdown and choose "Open Folder…"
            to open your own folder.
            You can also use the dropdown later to switch back to folders you've opened previously, including this
            sample project.
        </samp>
			</div>
    </li>
</ul>
!

CSS 

              
                
    .m-d.expand-list{
        margin: 0;
        padding: 0;
    }
    .m-d.expand-list > li{
        list-style-type: none;
        padding: 15px 0;
        border-bottom: 1px solid #212121;
        position: relative;
/*         max-width: 80%; */
    }
    .m-d label[class^="tab"]:hover{
        cursor: pointer;
    }
    .m-d input{
        -webkit-appearance: none;
        -moz-appearance: none;
        appearance: none;
    }
    .m-d input[class^="tab"]{
        width: 100%;
        height: 40px;
        position: absolute;
        left: 0;
        top: 0; 
    }
		.m-d input[class^="tab"]:hover{
			cursor: pointer;
		}
    .m-d label[class^="tab"]{
        font-weight: bold;
    }
    .m-d .content{
        height: auto;
        max-height: 0;
        max-width: 300px;
/*        background: yellow;*/
        overflow: hidden;
        transform: translateY(20px);
        transition: all 180ms ease-in-out 0ms; 
    }
    .m-d li[data-md-content="100"] input[class^="tab"]:checked ~ .content{
        max-height: 100px;
        transition: all 150ms ease-in-out 0ms;
    }
    .m-d li[data-md-content="200"] input[class^="tab"]:checked ~ .content{
        max-height: 200px;
        transition: all 200ms ease-in-out 0ms;
    }
    .m-d li[data-md-content="300"] input[class^="tab"]:checked ~ .content{
        max-height: 300px;
        transition: all 250ms ease-in-out 0ms;
    }
    .m-d li[data-md-content="400"] input[class^="tab"]:checked ~ .content{
        max-height: 400px;
        transition: all 250ms ease-in-out 0ms;
    }
    .m-d li[data-md-content="500"] input[class^="tab"]:checked ~ .content{
        max-height: 500px;
        transition: all 250ms ease-in-out 0ms;
    }
    .m-d li[data-md-content="600"] input[class^="tab"]:checked ~ .content{
        max-height: 600px;
        transition: all 250ms ease-in-out 0ms;
    }
    .m-d li[data-md-content="700"] input[class^="tab"]:checked ~ .content{
        max-height: 700px;
        transition: all 300ms ease-in-out 0ms;
    }
    .m-d li[data-md-content="800"] input[class^="tab"]:checked ~ .content{
        max-height: 800px;
        transition: all 300ms ease-in-out 0ms;
    }
    .m-d li[data-md-content="900"] input[class^="tab"]:checked ~ .content{
        max-height: 900px;
        transition: all 300ms ease-in-out 0ms;
    }
    .m-d li[data-md-content="1000"] input[class^="tab"]:checked ~ .content{
        max-height: 1000px;
        transition: all 350ms ease-in-out 0ms;
    }
		.m-d li[data-md-content=""] input[class^="tab"]:checked ~ .content{
        max-height: 1000px;
        transition: all 250ms ease-in-out 0ms;
    }
    .m-d input[class^="tab"]:checked ~ .content{
        margin-bottom: 20px;
    }
    
    .m-d .open-close-icon{
        display: inline-block;
        position: absolute;
        right: 20px;
        transform: translatey(2px);
    }
    .m-d .open-close-icon i{
        position: absolute;
        left: 0;
    }
    .m-d .open-close-icon .fa-minus{
        transform:rotate(-90deg);
        transition: transform 150ms ease-in-out 0ms;
    }
    .m-d input[class^="tab"]:checked ~ .open-close-icon .fa-minus{
        transform: rotate(0deg);
        transition: transform 150ms ease-in-out 0ms;
    }
    .m-d .open-close-icon .fa-plus{
        opacity: 1;
        transform:rotate(-90deg);
        transition: opacity 50ms linear 0ms, transform 150ms ease-in-out 0ms;
    }
    .m-d input[class^="tab"]:checked ~ .open-close-icon .fa-plus{
        opacity: 0;
        transform: rotate(0deg);
        transition: opacity 50ms linear 0ms, transform 150ms ease-in-out 0ms; 
    }
    























*{
	line-height: 1.4;
	font-family: "harmonia sans", roboto, arial;
}
!

JS
!
999px

Console