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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>

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Insecure Resource

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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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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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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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Packages

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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 

              
                mixin pane(color = "red", icon = "yin-yang", title = "Title", subtitle = "Subtitle content")
	div(class=attributes.class + " cursor-pointer duration-700 ease-in-out flex-grow m-2 min-h-14 min-w-14 overflow-hidden pane relative rounded-3xl transition-all")
		div(class="absolute background bg-center bg-cover bg-" + color + "-500 bg-" + color + "-img bg-no-repeat duration-700 ease-in-out inset-0 scale-105 transition-all z-10")
		div(class="absolute bg-gradient-to-b bottom-0 duration-700 ease-in-out from-transparent h-1/2 inset-x-0 opacity-0 shadow to-black transform transition-all translate-y-1/2 z-20")
		div(class="absolute bottom-0 duration-700 ease-in-out flex label left-0 mb-2 ml-3 sm:mb-3 sm:ml-2 transition-all z-30")
			div(class="bg-gray-900 flex h-10 icon items-center justify-center mr-3 rounded-full text-" + color + "-500 w-10")
				i(class="fas fa-" + icon)
			div(class="content flex flex-col justify-center leading-tight text-white whitespace-pre")
				div(class="ease-in-out font-bold duration-700 opacity-0 relative transform transition-all translate-x-8")= title
				div(class="delay-100 duration-700 ease-in-out opacity-0 relative transform transition-all translate-x-8")= subtitle

div(class="antialiased bg-gradient-to-b flex flex-col font-sans from-black items-stretch justify-center h-screen p-2 to-gray-900 sm:flex-row sm:items-center")
	div(class="flex flex-col flex-grow items-stretch max-w-2xl min-w-md w-full sm:flex-row sm:h-72 sm:overflow-hidden")
		+pane("red", "walking", "Imagine", "Chase your dreams")(class="active")
		+pane("yellow", "apple-alt", "Build", "Realize your vision")
		+pane("green", "tree", "Explore", "Discover the world")
		+pane("blue", "tint", "Adapt", "Embrace the times")
		+pane("purple", "palette", "Inspire", "Share your potential")
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CSS 

              
                .pane.active {
	flex-grow: 10;
	max-width: 100%;
	
	.background {
		transform: scale(1.25, 1.25);
	}

	.label {
		@media (min-width: 640px) {
			transform: translateX(0.5rem);
		}

		.content > * {
			opacity: 1;
			transform: translateX(0);
		}
	}

	.shadow {
		opacity: 0.75;
		transform: translateY(0);
	}
}
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JS 

              
                const panes = document.querySelectorAll('.pane');
let activePaneIndex = 0;

panes.forEach((pane, index) => {
	pane.addEventListener('click', () => {
		panes[activePaneIndex].classList.remove('active');
		activePaneIndex = index;
		panes[activePaneIndex].classList.add('active');
	});
});

tailwind.config = {
	theme: {
		extend: {
			backgroundImage: {
				'blue-img': 'url("https://images.unsplash.com/photo-1523633589114-88eaf4b4f1a8?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&fit=crop&w=460&h=340&q=100")',
				'green-img': 'url("https://images.unsplash.com/photo-1488330890490-c291ecf62571?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&fit=crop&w=460&h=340&q=100")',
				'purple-img': 'url("https://images.unsplash.com/photo-1511800453077-8c0afa94175f?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&fit=crop&w=460&h=340&q=100")',
				'red-img': 'url("https://images.unsplash.com/photo-1519181245277-cffeb31da2e3?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&fit=crop&w=460&h=340&q=100")',
				'yellow-img': 'url("https://images.unsplash.com/photo-1485550409059-9afb054cada4?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&fit=crop&w=460&h=340&q=100")'
			},
			colors: {
				gray: {
					'900': '#0f1011'
				}
			},
			minHeight: {
				'14': '3.5rem'
			},
			minWidth: {
				'14': '3.5rem'
			},
			transitionTimingFunction: {
				'in-out': 'cubic-bezier(0.2, 1, 0.25, 1)'
			}
		}
	}
};
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999px

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