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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>

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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

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <fieldset class="checkbox-group">
	<legend class="checkbox-group-legend">Choose your favorites</legend>
	<div class="checkbox">
		<label class="checkbox-wrapper">
			<input type="checkbox" class="checkbox-input" />
			<span class="checkbox-tile">
				<span class="checkbox-icon">
					<svg xmlns="http://www.w3.org/2000/svg" width="192" height="192" fill="currentColor" viewBox="0 0 256 256">
						<rect width="256" height="256" fill="none"></rect>
						<circle cx="96" cy="144.00002" r="10"></circle>
						<circle cx="160" cy="144.00002" r="10"></circle>
						<path d="M74.4017,80A175.32467,175.32467,0,0,1,128,72a175.32507,175.32507,0,0,1,53.59754,7.99971" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M181.59717,176.00041A175.32523,175.32523,0,0,1,128,184a175.32505,175.32505,0,0,1-53.59753-7.99971" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M155.04392,182.08789l12.02517,24.05047a7.96793,7.96793,0,0,0,8.99115,4.20919c24.53876-5.99927,45.69294-16.45908,61.10024-29.85086a8.05225,8.05225,0,0,0,2.47192-8.38971L205.65855,58.86074a8.02121,8.02121,0,0,0-4.62655-5.10908,175.85294,175.85294,0,0,0-29.66452-9.18289,8.01781,8.01781,0,0,0-9.31925,5.28642l-7.97318,23.91964" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M100.95624,182.08757l-12.02532,24.0508a7.96794,7.96794,0,0,1-8.99115,4.20918c-24.53866-5.99924-45.69277-16.459-61.10006-29.85069a8.05224,8.05224,0,0,1-2.47193-8.38972L50.34158,58.8607a8.0212,8.0212,0,0,1,4.62655-5.1091,175.85349,175.85349,0,0,1,29.66439-9.18283,8.0178,8.0178,0,0,1,9.31924,5.28642l7.97318,23.91964" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
					</svg>
				</span>
				<span class="checkbox-label">Discord</span>
			</span>
		</label>
	</div>
	<div class="checkbox">
		<label class="checkbox-wrapper">
			<input type="checkbox" class="checkbox-input" checked />
			<span class="checkbox-tile">
				<span class="checkbox-icon">
					<svg xmlns="http://www.w3.org/2000/svg" width="192" height="192" fill="currentColor" viewBox="0 0 256 256">
						<rect width="256" height="256" fill="none"></rect>
						<polygon points="56 100 56 168 128 236 128 168 200 168 56 32 200 32 200 100 56 100" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></polygon>
					</svg>
				</span>
				<span class="checkbox-label">Framer</span>
			</span>
		</label>
	</div>
	<div class="checkbox">
		<label class="checkbox-wrapper">
			<input type="checkbox" class="checkbox-input" />
			<span class="checkbox-tile">
				<span class="checkbox-icon">
					<svg xmlns="http://www.w3.org/2000/svg" width="192" height="192" fill="currentColor" viewBox="0 0 256 256">
						<rect width="256" height="256" fill="none"></rect>
						<polygon points="72 40 184 40 240 104 128 224 16 104 72 40" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></polygon>
						<polygon points="177.091 104 128 224 78.909 104 128 40 177.091 104" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></polygon>
						<line x1="16" y1="104" x2="240" y2="104" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></line>
					</svg>
				</span>
				<span class="checkbox-label">Sketch</span>
			</span>
		</label>
	</div>
	<div class="checkbox">
		<label class="checkbox-wrapper">
			<input type="checkbox" class="checkbox-input" />
			<span class="checkbox-tile">
				<span class="checkbox-icon">
					<svg xmlns="http://www.w3.org/2000/svg" width="192" height="192" fill="currentColor" viewBox="0 0 256 256">
						<rect width="256" height="256" fill="none"></rect>
						<circle cx="128" cy="128" r="40" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></circle>
						<rect x="36" y="36" width="184" height="184" rx="48" stroke-width="12" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" fill="none"></rect>
						<circle cx="180" cy="75.99998" r="10"></circle>
					</svg>
				</span>
				<span class="checkbox-label">Instagram</span>
			</span>
		</label>
	</div>
	<div class="checkbox">
		<label class="checkbox-wrapper">
			<input type="checkbox" class="checkbox-input" />
			<span class="checkbox-tile">
				<span class="checkbox-icon">
					<svg xmlns="http://www.w3.org/2000/svg" width="192" height="192" fill="currentColor" viewBox="0 0 256 256">
						<rect width="256" height="256" fill="none"></rect>
						<circle cx="128" cy="128" r="96" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></circle>
						<path d="M71.0247,205.27116a159.91145,159.91145,0,0,1,136.98116-77.27311q8.09514,0,15.99054.78906" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M188.0294,53.09083A159.68573,159.68573,0,0,1,64.00586,111.99805a160.8502,160.8502,0,0,1-30.15138-2.83671" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M85.93041,41.68508a159.92755,159.92755,0,0,1,78.99267,138.00723,160.35189,160.35189,0,0,1-4.73107,38.77687" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
					</svg>
				</span>
				<span class="checkbox-label">Dribbble</span>
			</span>
		</label>
	</div>
	<div class="checkbox">
		<label class="checkbox-wrapper">
			<input type="checkbox" class="checkbox-input" />
			<span class="checkbox-tile">
				<span class="checkbox-icon">
					<svg xmlns="http://www.w3.org/2000/svg" width="192" height="192" fill="currentColor" viewBox="0 0 256 256">
						<rect width="256" height="256" fill="none"></rect>
						<circle cx="128" cy="128" r="96" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></circle>
						<g>
							<path d="M179.1333,108.32931a112.19069,112.19069,0,0,0-102.3584.04859" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
							<path d="M164.29541,136.71457a79.94058,79.94058,0,0,0-72.68359.04736" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
							<path d="M149.47217,165.07248a47.97816,47.97816,0,0,0-43.03662.04736" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						</g>
					</svg>
				</span>
				<span class="checkbox-label">Spotify</span>
			</span>
		</label>
	</div>
	<div class="checkbox">
		<label class="checkbox-wrapper">
			<input type="checkbox" class="checkbox-input" />
			<span class="checkbox-tile">
				<span class="checkbox-icon">
					<svg xmlns="http://www.w3.org/2000/svg" width="192" height="192" fill="currentColor" viewBox="0 0 256 256">
						<rect width="256" height="256" fill="none"></rect>
						<circle cx="162" cy="128" r="34" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></circle>
						<path d="M128,94V26.00089H94a34,34,0,0,0,0,68Z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M128,161.99911V94H94a34,34,0,0,0,0,68Z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M128,94V26.00089h34a34,34,0,0,1,0,68Z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M128,161.99911v34.00044A34,34,0,1,1,94,162Z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
					</svg>
				</span>
				<span class="checkbox-label">Figma</span>
			</span>
		</label>
	</div>
	<div class="checkbox">
		<label class="checkbox-wrapper">
			<input type="checkbox" class="checkbox-input" checked/>
			<span class="checkbox-tile">
				<span class="checkbox-icon">
					<svg xmlns="http://www.w3.org/2000/svg" width="192" height="192" fill="currentColor" viewBox="0 0 256 256">
						<rect width="256" height="256" fill="none"></rect>
						<path d="M80,56.00005h24a0,0,0,0,1,0,0v72a24,24,0,0,1-24,24h0a24,24,0,0,1-24-24V80a24,24,0,0,1,24-24Z" transform="translate(184.00005 24.00003) rotate(90)" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M128,80H104a24,24,0,0,1-24-24V56a24,24,0,0,1,24-24h0a24,24,0,0,1,24,24Z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M152,32.00007h24a0,0,0,0,1,0,0v72a24,24,0,0,1-24,24h0a24,24,0,0,1-24-24V56a24,24,0,0,1,24-24Z" transform="translate(304 160.00011) rotate(180)" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M176,128V104a24,24,0,0,1,24-24h0a24,24,0,0,1,24,24v0a24,24,0,0,1-24,24Z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M176,104.00005h24a0,0,0,0,1,0,0v72a24,24,0,0,1-24,24h0a24,24,0,0,1-24-24V128A24,24,0,0,1,176,104.00005Z" transform="translate(23.99995 328.00003) rotate(-90)" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M128,176h24a24,24,0,0,1,24,24v0a24,24,0,0,1-24,24h0a24,24,0,0,1-24-24Z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M104,128h24a0,0,0,0,1,0,0v72a24,24,0,0,1-24,24h0a24,24,0,0,1-24-24V152A24,24,0,0,1,104,128Z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
						<path d="M80,128v24a24,24,0,0,1-24,24h0a24,24,0,0,1-24-24v0a24,24,0,0,1,24-24Z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="12"></path>
					</svg>
				</span>
				<span class="checkbox-label">Slack</span>
			</span>
		</label>
	</div>
</fieldset>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap");

*,
*:after,
*:before {
	box-sizing: border-box;
}

body {
	font-family: "Inter", sans-serif;
	line-height: 1.5;
	min-height: 100vh;
	display: flex;
	align-items: center;
	justify-content: center;
	background-color: #f8f8f9;
}

.checkbox-group {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	width: 90%;
	margin-left: auto;
	margin-right: auto;
	max-width: 600px;
	user-select: none;
	& > * {
		margin: .5rem 0.5rem;
	}
}



.checkbox-group-legend {
	font-size: 1.5rem;
	font-weight: 700;
	color: #9c9c9c;
	text-align: center;
	line-height: 1.125;
	margin-bottom: 1.25rem;
}

.checkbox-input {
	// Code to hide the input
	clip: rect(0 0 0 0);
	clip-path: inset(100%);
	height: 1px;
	overflow: hidden;
	position: absolute;
	white-space: nowrap;
	width: 1px;

	&:checked + .checkbox-tile {
		border-color: #2260ff;
		box-shadow: 0 5px 10px rgba(#000, 0.1);
		color: #2260ff;
		&:before {
			transform: scale(1);
			opacity: 1;
			background-color: #2260ff;
			border-color: #2260ff;
		}
		
		.checkbox-icon, .checkbox-label {
			color: #2260ff;
		}
	}
	
	&:focus + .checkbox-tile {
		border-color: #2260ff;
		box-shadow: 0 5px 10px rgba(#000, 0.1), 0 0 0 4px #b5c9fc;
		&:before {
			transform: scale(1);
			opacity: 1;
		}
	}
}

.checkbox-tile {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	width: 7rem;
	min-height: 7rem;
	border-radius: 0.5rem;
	border: 2px solid #b5bfd9;
	background-color: #fff;
	box-shadow: 0 5px 10px rgba(#000, 0.1);
	transition: 0.15s ease;
	cursor: pointer;
	position: relative;

	&:before {
		content: "";
		position: absolute;
		display: block;
		width: 1.25rem;
		height: 1.25rem;
		border: 2px solid #b5bfd9;
		background-color: #fff;
		border-radius: 50%;
		top: 0.25rem;
		left: 0.25rem;
		opacity: 0;
		transform: scale(0);
		transition: 0.25s ease;
		background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='192' height='192' fill='%23FFFFFF' viewBox='0 0 256 256'%3E%3Crect width='256' height='256' fill='none'%3E%3C/rect%3E%3Cpolyline points='216 72.005 104 184 48 128.005' fill='none' stroke='%23FFFFFF' stroke-linecap='round' stroke-linejoin='round' stroke-width='32'%3E%3C/polyline%3E%3C/svg%3E");
		background-size: 12px;
		background-repeat: no-repeat;
		background-position: 50% 50%;
	}

	&:hover {
		border-color: #2260ff;
		&:before {
			transform: scale(1);
			opacity: 1;
		}
	}
}

.checkbox-icon {
	transition: .375s ease;
	color: #494949;
	svg {
		width: 3rem;
		height: 3rem;
	}
}

.checkbox-label {
	color: #707070;
	transition: .375s ease;
	text-align: center;
}
!

JS 

              
                // Nope
!
999px

Console