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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.

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.

If the stylesheet 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 CSS 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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About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

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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Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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HTML

            
              body
	header.header
		// Fake logo markup, see article for real markup
		a.logo(href="#" title="Go to home page") Logo

		nav.primary-nav(aria-label="Primary")
			ul
				- var i = 0;
				while i < 3
					-i++;
					li: a(href='#') Primary nav

		form.search(role="search" aria-label="site")
			label
				span Search
				input(type="search")
			button(type="submit") Submit

	nav.secondary-nav(aria-label="Secondary")
		ul
			- var i = 0;
			while i < 5
				-i++;
				li: a(href='#') Secondary nav		

	main
		article
			h1 Main article heading

			p Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quae sunt igitur communia vobis cum antiquis, iis sic utamur quasi concessis; Nihil acciderat ei, quod nollet, nisi quod anulum, quo delectabatur, in mari abiecerat. Unum est sine dolore esse, alterum cum voluptate. Laboro autem non sine causa; Theophrasti igitur, inquit, tibi liber ille placet de beata vita? Nihil opus est exemplis hoc facere longius. Duo Reges constructio interrete. Graecum enim hunc versum nostis omnes Suavis laborum est praeteritorum memoria. Haec et tu ita posuisti, et verba vestra sunt.

			h2 Article secondary heading

			p Nos commodius agimus. A mene tu? Tantum dico, magis fuisse vestrum agere Epicuri diem natalem, quam illius testamento cavere ut ageretur. Tenesne igitur, inquam, Hieronymus Rhodius quid dicat esse summum bonum, quo putet omnia referri oportere? Nihilo beatiorem esse Metellum quam Regulum. Sed quanta sit alias, nunc tantum possitne esse tanta. Philosophi autem in suis lectulis plerumque moriuntur. Esse enim, nisi eris, non potes.

			p Sunt enim quasi prima elementa naturae, quibus ubertas orationis adhiberi vix potest, nec equidem eam cogito consectari. Id Sextilius factum negabat. Quorum sine causa fieri nihil putandum est. Quae autem natura suae primae institutionis oblita est?

	aside(aria-label="Sidebar")
		section.share
			h2 Share
			ul
				li
					a(href='#') Facebook
				li
					a(href='#') Twitter
				li
					a(href='#') Email

		section.recommended
			h2 Recommended
			ul
				li
					article
						h3
							a(href='#') Related article
						p Article description
				li
					article
						h3
							a(href='#') Related article
						p Article description

	footer
		ul
			- var i = 0;
			while i < 5
				-i++;
				li: a(href='#') Footer link
!

CSS

            
              
.visually-hidden {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}


body {
	max-width: 120ch;
	min-width: 800px;
	margin: 20px auto;
	padding: 20px;
	padding-bottom: 0;
	
	display: grid;
	grid-template:
		"header  header  header"
		"divider divider divider"
		"nav     main    sidebar"
		"footer  footer  footer" /
		 200px    1fr    200px;
	grid-gap: 20px 40px;
	
	&::before {
		content: '';
		display: block;
		grid-area: divider;
		border-bottom: 1px dashed #000;
	}
	
	> header {
		grid-area: header;
	}
}

.header {
	display: grid;
	grid-template: 
		"logo ........... ......" 1fr
		"logo primary-nav search" auto
		"logo ........... ......" 1fr /
		200px 1fr         200px;
	grid-gap: 0 40px;
}

.primary-nav {
	grid-area: primary-nav;
	display: flex;

	ul {
		flex-grow: 1;
		display: flex;
		list-style: none;
		padding: 0;
		margin-left: -20px;
	}
		
	li {
		margin-left: 20px;
		flex-grow: 1;
		display: flex;
		text-align: center;
	}
		
	a {
		display: flex;
		align-items: center;
		justify-content: center;
		width: 100%;
		background-color: #000;
		color: #fff;
		text-decoration: none;
		padding: 10px 20px;
	}
}

.logo {
	grid-area: logo;
	border: 3px solid #000;
	padding: 10px 20px;
	font-size: 2em;
	margin: 0;
	text-align: center;
	text-decoration: none;
	color: #000;
}

.search {
	grid-area: search;
	display: flex;
	align-items: flex-end;
	
	input {
		width: 100%;
	}
}

.secondary-nav {
	grid-area: nav;
	background-color: lightgray;
	padding: 20px;
	flex-grow: 1;

	
	ul {
		list-style: none;
		padding: 0;
		display: grid;
		width: 100%;
		grid-template-columns: 1fr;
		grid-gap: 10px;
	}
	
	li {
		display: flex;
		width: 100%;
	}
	
	a {
		background: #fff;
		flex-grow: 1;
		display: flex;
		align-items: center;
		justify-content: center;
		color: #000;
		text-decoration: none;
		font-weight: bold;
		padding: 28px 0;
	}
	
}

main {
	grid-area: main;
	
	p {
		&:last-child {
			margin-bottom: 0;
		}
	}
}

aside {
	grid-area: sidebar;
	background: lightgray;
	padding: 20px;
	
	section {
		margin-bottom: 2.5em;
	}
	
	h2 {
		margin: 0;
		margin-bottom: 0.5em;
		font-size: 1.2em;
	}
}

.share {
	ul {
		background: #fff;
		padding-top: 5px;
		padding-bottom: 15px;
	}
	li {
		margin-top: 0.5em;
	}
}

.recommended {
	ul {
		list-style: none;
		padding: 0;
	}
	li {
		background: #fff;
		padding: 10px;
		margin-top: 10px;
	}
	h3 {
		margin: 0;
		margin-bottom: 0.5em;
	}
	p {
		margin: 0;
	}
}

footer {
	grid-area: footer;
	padding: 20px;
	border-top: 1px dashed #000;
	margin-top: 20px;
	
	ul {
		display: block;
		list-style: none;
		padding: 0;
		text-align: center;
	}
	
	li {
		display: inline-block;
		margin-left: 10px;
	}
	
	a {
		color: #000;
		text-decoration: none;
	}
}

h1 {
	margin: 0;
	font-size: 2.5em;
}

h2 {
	font-size: 1.5em;
}

ul {
	margin: 0;
}

a {
	color: #000;
}
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