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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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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.

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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 

              
                <body class="dark-mode flex align-center justify-center">
	<div class="grid columns-2">
		<header class="span-all flex align-center space-between">
			<h1><code>box-shadow</code> Examples</h1>
			<a class="wl-button small icon" href="https://xhynk.com/" target="_blank">Made with 💖 by @Xhynk <i data-feather="chevron-right"></i></a>
		</header>
		<div class="wl-modal visible warning stark">
			<header class="flex space-between">
				<h4 class="flex align-center">
					<div class="icon"><i data-feather="frown"></i></div>
					<span>Stark Shadow</span>
				</h4>
			</header>
			<div class="content">This block has a very stark shadow. It's very bold and abrupt. It certainly has its place, but it doesn't look great on elements like this. Let's keep going.</div>
			<pre>box-shadow: 0 12px 20px #000;</pre>
		</div>
		<div class="wl-modal visible warning color">
			<header class="flex space-between">
				<h4 class="flex align-center">
					<div class="icon"><i data-feather="meh"></i></div>
					<span>Colored Shadow</span>
				</h4>
			</header>
			<div class="content">This block has a colored shadow that is a hex color based on the element itself and the background. This looks alright, but it will look bad if we have it on a different colored background</div>
			<pre>box-shadow: 0 12px 20px #1b1e20;</pre>
		</div>
		<div class="wl-modal visible alpha">
			<header class="flex space-between">
				<h4 class="flex align-center">
					<div class="icon"><i data-feather="smile"></i></div>
					<span>Alpha Shadow</span>
				</h4>
			</header>
			<div class="content">This block uses RGBA instead of a Hex color value to lighten the shadow. This works well to soften it, regardless of the background color - so it looks decent just about anywhere, and doesn't need modification.</div>
			<pre>box-shadow: 0 12px 20px rgba(0,0,0,.35);</pre>
		</div>
		<div class="wl-modal visible success subtle">
			<header class="flex space-between">
				<h4 class="flex align-center">
					<div class="icon"><i data-feather="award"></i></div>
					<span>Subtle Shadow</span>
				</h4>
			</header>
			<div class="content">This block makes use of <code>box-shadow</code>'s optional 4th argument, the "spread radius" or "choke". A positive value increases the spread, making it bolder. A negative value lowers the spread, making it more subtle! (keep in mind this will affect the border-radius of the shadow in relation to the element!)</div>
			<pre>box-shadow: 0 12px 24px -20px #000;</pre>
		</div>
		<div class="span-all text-center">
			<a href="https://developer.mozilla.org/en-US/docs/Web/CSS/box-shadow" target="_blank" class="wl-button secondary icon">Read More on MDN <i data-feather="external-link"></i></a>
		</div>
		<div class="wl-modal visible inset">
			<header class="flex space-between">
				<h4 class="flex align-center">
					<div class="icon"><i data-feather="plus-circle"></i></div>
					<span>Inset Shadow</span>
				</h4>
			</header>
			<div class="content">This block uses the <code>inset</code> value to invert the shadow and apply it <em>inside</em> the element instead of outside. The same subtlety principles apply here.</div>
			<pre>box-shadow: inset 6px 6px 16px -12px #000;</pre>
		</div>
		<div class="wl-modal visible multi">
			<header class="flex space-between">
				<h4 class="flex align-center">
					<div class="icon"><i data-feather="plus-circle"></i></div>
					<span>Multi Shadow</span>
				</h4>
			</header>
			<div class="content">You can chain together multiple box-shadows by comma separating them. This works with standard <em>and</em> inset shadows. Just… don't go <strong>too</strong> crazy…</div>
			<pre>box-shadow: -16px -16px 0 rgba(0,138,255,.2),
            inset 4px 4px 8px rgba(0,0,0,.5),
            0 0 0 3px #0095ee,
            16px 16px 0 rgba(255,255,255,.2);</pre>
		</div>
		<div class="nm-block span-all no-select">
			<div class="re-center">
				<div class="wl-modal visible neumorphic">
					<header class="flex space-between">
						<h4 class="flex align-center">
							<div class="icon"><i data-feather="power"></i></div>
							<span>Neumorphism</span>
						</h4>
					</header>
					<div class="content">With a little finagling, two box shadows (and sometimes a linear-gradient on the element), we can achieve a nice <a href="https://uxdesign.cc/neumorphism-in-user-interfaces-b47cef3bf3a6" target="_blank">"Neumorphism"</a> effect. This one does work best when using colored shadows to more closely match the background element, as you can't quite achieve a natural look with just the opacity of pure black.
						<p><strong>(Tip: Hover/click/tap on me!)</strong></p></div>
					<pre>background: linear-gradient(145deg, #272c31, #202529);
box-shadow: 30px 30px 60px #1e2227,
            -30px -30px 60px #2a3035;</pre>
				</div>
			</div>
		</div>
		<div class="wl-modal visible default span-all">
			<header class="flex space-between">
				<h4 class="flex align-center">
					<div class="icon"><i data-feather="sun"></i></div>
					<span>Bonus!</span>
				</h4>
			</header>
			<div class="content">If you don't specify a color for your box shadow, it will default to the current <code>color</code> for that element (that's the <em>text color!</em>)</div>
			<pre>box-shadow: 0 12px 24px;</pre>
		</div>
	</div>
	<div class="easy-edit">
		<a href="https://codepen.io/xhynk/pen/XWdOBwm/?editors=1100" target="_blank" class="wl-button primary small icon">Edit this Pen <i data-feather="edit"></i></a>
</body>
!

CSS 

              
                .stark   { box-shadow: 0 12px 20px #000; }
.color   { box-shadow: 0 12px 20px #161f2d; }
.alpha   { box-shadow: 0 12px 20px rgba(0,0,0,.35); }
.subtle  { box-shadow: 0 12px 24px -20px #000; }
.inset   { box-shadow: inset 0 6px 14px -6px #000; }
.multi   { box-shadow: -16px -16px 0 rgba(0,138,255,.2), inset 4px 4px 8px rgba(0,0,0,.5), 0 0 0 3px #0095ee, 16px 16px 0 rgba(255,255,255,.2); }
.default { box-shadow: 0 12px 24px; }

.neumorphic {
	border-radius: 30px;
	background-color: #24292e;
	background: linear-gradient(145deg, #272c31, #202529) !important;
	box-shadow: 30px 30px 60px #1e2227, -30px -30px 60px #2a3035;
	
	&:hover {
		cursor: pointer;
		background: linear-gradient(145deg, #202529, #272c31) !important;
	}
	
	&:active {
		background: #24292e !important;
		box-shadow: inset 20px 20px 40px #1c2024, inset -20px -20px 40px #2c3238;
	}
}



/**
 * No need to look down here, this is just modifying the layout and such. Don't look at it, it's disgusting 🤮
 */
.no-select{-webkit-touch-callout:none;-webkit-user-select:none;-khtml-user-select:none;-moz-user-select:none;-ms-user-select: none;user-select: none;-webkit-tap-highlight-color:transparent;}.easy-edit{position:fixed;bottom:10px;right:10px;z-index:101;}.nm-block{padding:100px;text-align:center;position:relative;&:after{content:"";position:absolute;background:#24292e;left:-100vw;right:-100vw;height:180%;top:0}.re-center{margin:0 auto;max-width:calc(100vw - 80px)}}.default{margin-top:3em!important}a:not(.wl-button){text-decoration:none;font-weight:600;color:#0095ee;&:hover{color:#22b7ff!important}}::-webkit-scrollbar-track{-webkit-box-shadow:none;background-color:transparent}::-webkit-scrollbar{width:16px;background-color:transparent}::-webkit-scrollbar-thumb{background-color:#0095ee;-webkit-border-radius:8px;border-radius:8px;border:6px solid #262b31}body{background-image:linear-gradient(100deg,#24292e 70%,#20252a 70.1%,#20252a calc(70.1% + 30px),#336284 calc(70.1% + 31px))!important;background-repeat:no-repeat!important;background-size:cover!important;background-attachment:fixed!important}h1{margin:0}.wl-modal{position:relative;max-height:none;max-width:none;min-width:0;width:100%;overflow:visible;z-index:10;text-align:left}.grid{grid-gap:3em;width:calc(100% - 80px);max-width:980px;margin:40px 0}*{box-sizing:border-box}svg,svg *{box-sizing:content-box}pre,code{background:rgba(0,0,0,.2);padding:0 .5em;overflow:auto}pre{max-width:100%}@media all and (max-width:860px){.grid[class*="columns"]{grid-template-columns:100%}.wl-modal{margin:0 auto;max-width:100%}}@media all and (max-width:480px){.grid{width:calc(100% - 36px)}}@media all and (max-width:768px){.nm-block{padding:80px 10%;}}
!

JS 

              
                feather.replace();

var urlParams = new URLSearchParams(window.location.search);
		editors   = urlParams.get('editors');
if( editors != null ){
	document.querySelector('.easy-edit').remove();
}
!
999px

Console