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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

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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Packages

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HTML 

              
                <div class="container">
	
	<article class="grid">
		<figure class="grid__media">
			<img src="https://images.unsplash.com/photo-1472491235688-bdc81a63246e?ixlib=rb-0.3.5&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=17d687b8b0b7e6da5ee22d8f343f09cd" alt="A beautiful siamese cat with blue eyes" width="800px" height="600px" />
		</figure>
		<div class="grid__text">
			<h3>Cats are great</h3>
			<p>While it is commonly thought that the ancient Egyptians were the first to domesticate cats, the oldest known pet cat was recently found in a 9,500-year-old grave on the Mediterranean island of Cyprus. This grave predates early Egyptian art depicting cats by 4,000 years or more.</p>
		</div>
	</article>
	
	<!--Grid 2-->
	<article class="grid grid--2">
		<figure class="grid__media">
			<img src="https://images.unsplash.com/photo-1455970022149-a8f26b6902dd?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=71ae25c1db2bdf4ece600a85186fb6e5" alt="A fluffy tabby cat with green eyes" width="600px" height="800px" />
		</figure>
		<div class="grid__text">
			<h3>Cat limitations</h3>
			<p>A cat can’t climb head first down a tree because every claw on a cat’s paw points the same way. To get down from a tree, a cat must back down.</p>
		</div>
	</article>
	
	<!--Grid 3-->
	<article class="grid grid--3">
		<figure class="grid__media">
			<img src="https://images.unsplash.com/photo-1511275539165-cc46b1ee89bf?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=fbdeefbc87de11ffe211f913e6439430" alt="A grey cats lying down licking its paw" width="800px" height="600px" />
		</figure>
		<div class="grid__text">
			<h3>Space cats</h3>
			<p>The first cat in space was a French cat named Felicette (a.k.a. “Astrocat”) In 1963, France blasted the cat into outer space. Electrodes implanted in her brains sent neurological signals back to Earth. She survived the trip.</p>
		</div>
	</article>

	<!--Grid 4-->
	<article class="grid grid--4">
		<figure class="grid__media">
			<img src="https://images.unsplash.com/photo-1518843025960-d60217f226f5?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=6d2c2d79afc7d50fe882bdca5e4bbd4a" alt="A tortoiseshell cat looking alert" width="600px" height="800px" />
		</figure>
		<div class="grid__text">
			<h3>Cats are brainy</h3>
			<p>A cat’s brain is biologically more similar to a human brain than it is to a dog’s. Both humans and cats have identical regions in their brains that are responsible for emotions.</p>
		</div>
	</article>

	<div class="grid grid--bg">
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
	</div>
</div>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700");

* {
	box-sizing: border-box;
}

// Basic visual styling
body {
	font-family: 'Open Sans', sans-serif;
}

img {
	width: 100%;
	height: auto;
	display: block;
}

figure {
	margin: 0;
}

h3 {
	margin: 0 0 20px 0;
	font-size: 1.6rem;
	letter-spacing: -0.04em;
}

p {
	line-height: 1.4;
	margin-bottom: 0;
}

.container {
	position: relative;
}

// Grid stuff starts here
.grid {
	padding: 40px 0;
	
	@media (min-width: 768px) {
		display: grid;
		grid-template-columns: [start] minmax(20px, 1fr) [wrapper-start] repeat(12, minmax(0, 70px)) [wrapper-end] minmax(20px, 1fr) [end];
		grid-gap: 20px;
	}
}

.grid__media {
	grid-column: var(--mediaStart, wrapper-start) / var(--mediaEnd, 8);
}

.grid__text {
	grid-column: var(--textStart, 8) / span var(--textSpan, 6);
	padding: 20px;
	
	@media (min-width: 768px) {
		padding: 0;
	}
}

.grid__media,
.grid__text {
	grid-row: 1; // We want to keep our items on the same row
}

.grid--2,
.grid--4 {
	--mediaStart: 8;
	--mediaEnd: 14;
	--textStart: wrapper-start;
}

// Placement with variables
@media(min-width: 960px) {
	.grid {
		--mediaStart: wrapper-start;
		--mediaEnd: 9;
		--textStart: 10;
		--textSpan: 4;
	}
	
	.grid--2 {
		--mediaStart: 9;
		--mediaEnd: end;
		--textStart: wrapper-start;
	}

	.grid--2,
	.grid--4 {
		--mediaStart: 8;
	}

	.grid--3 {
		--mediaStart: start;
	}

	.grid--4 {
		--mediaEnd: wrapper-end;
		--textStart: 3;
	}
}

// Background grid, for illustration
.grid--bg {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: -1;
	
	div {
		background-color: #ECEFF1;
	}
}
!

JS
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999px

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