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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.

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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

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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-.

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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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Packages

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HTML 

              
                <div class="toggles">
	<details open>
		<summary>What is Envato Tuts+? </summary>
		<div>
			<p>Envato Tuts+ publishes video courses, eBooks, and written tutorials to help you learn creative and technical skills. You can read more about Envato Tuts+ and how we can help you learn over on our About page.</p>
		</div>
	</details>
	<details>
		<summary>Can I write for Envato Tuts+?</summary>
		<div>
			<p>We're always on the look-out for talented people who'd like to teach their skills. Visit our Teach at Envato Tuts+ page to learn more.</p>
		</div>
	</details>
	<details>
		<summary>Who writes and publishes the tutorials and courses I see on Envato Tuts+?</summary>
		<div>
			<p>Our team of editors ensures that each topic on Envato Tuts+ is full of up-to-date, inspirational and educational resources, from instructors who have experience and expertise in their fields. All the courses and tutorials published on Envato Tuts+ are original material, with a focus on teaching you practical and relevant skills.</p>
		</div>
	</details>
	<details>
		<summary>Where do I find courses I’ve started watching previously?</summary>
		<div>
			<p>Your My Courses page displays all the courses you’ve watched, so you can find them quickly and keep on learning!</p>
		</div>
	</details>
	<details>
		<summary>Can I download project files for a course?</summary>
		<div>
			<p>Yes, if you have access to a course (via purchase or any subscription plan), then you can download the relevant project source files.</p>
		</div>
	</details>	
</div>
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CSS 

              
                * {
	box-sizing: border-box;
}

body {
	display: flex;
	justify-content: center;
	padding: 4rem;
}

.toggles {
	font-family: "Source Sans Pro", Arial, sans-serif;
	color: #b5b5b5;
	font-size: 18px;
	width: 75%;

	details {
		margin-bottom: 0.75rem;

		> div {
			margin-left: 2rem;
			padding: 1rem 0;
		}

		summary {
			border: 1px solid rgba(0, 0, 0, 0.1);
			box-sizing: border-box;
			box-shadow: 0px 6px 12px rgba(0, 0, 0, 0.05);
			border-radius: 8px;
			padding: 1rem 2rem;
			font-weight: 600;
			cursor: pointer;
			list-style: none; // remove the default triangle
			outline: none; // for chrome
			position: relative;
			transition: color 0.2s;

			&::-webkit-details-marker {
				display: none; // for chrome
			}

			&::before {
				content: "\f078";
				font-family: "Font Awesome 5 Free";
				position: absolute;
				top: 50%;
				right: 2rem;
				transform: translateY(-50%);
			}

			&:hover {
				color: #4d4d4d;
			}
		}
	}

	details[open] {
		color: #4d4d4d;

		summary::before {
			content: "\f077";
		}
	}
}
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JS
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999px

Console