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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

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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).

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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 

              
                
<nav>
	<ul>
		<li>
			<a class="active">
				<svg><use xlink:href="#home-icon"></use></svg>
			</a>
		</li>
	</ul>
	<ul>
		<li>
			<a>
				<svg><use xlink:href="#bookmark-icon"></use></svg>
			</a>
		</li>
	</ul>
	<ul>
		<li>
			<a>
				<svg><use xlink:href="#plus-icon"></use></svg>
			</a>
		</li>
	</ul>
	<ul>
		<li>
			<a>
				<svg><use xlink:href="#user-icon"></use></svg>
			</a>
		</li>
	</ul>
	<ul>
		<li>
			<a>
				<svg><use xlink:href="#settings-icon"></use></svg>
			</a>
		</li>
	</ul>

	<div class="tubelight">
		<div class="light-ray"></div>
	</div>
</nav>



<svg xmlns="http://www.w3.org/2000/svg" style="display: none;">
	<symbol xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" id="home-icon">
		<path
				d="M13.1428571,14.5 C13.6571429,14.5 14,14.175507 14,13.6887676 L14,6.38767551 C14,6.14430577 13.9142857,5.90093604 13.6571429,5.73868955 L8.51428571,1.6825273 C8.17142857,1.43915757 7.74285714,1.43915757 7.4,1.6825273 L2.25714286,5.73868955 C2.08571429,5.90093604 2,6.14430577 2,6.38767551 L2,13.6887676 C2,14.175507 2.34285714,14.5 2.85714286,14.5 L13.1428571,14.5 Z M5.42857143,12.8775351 L3.71428571,12.8775351 L3.71428571,6.79329173 L8,3.38611544 L12.2857143,6.79329173 L12.2857143,12.8775351 L10.5714286,12.8775351 L5.42857143,12.8775351 Z">
		</path>
	</symbol>
	<symbol xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" id="favorites-icon">
		<path
				d="M7.5125,14.3196446 C6.8625,13.7292662 1.5,9.09057902 1.5,5.54830881 C1.5,3.27113511 3.2875,1.5 5.4,1.5 C6.375,1.5 7.26875,1.92169883 8,2.5120772 C8.73125,1.83735907 9.625,1.5 10.6,1.5 C12.79375,1.5 14.5,3.35547487 14.5,5.54830881 C14.5,9.09057902 9.1375,13.7292662 8.4875,14.2353048 C8.24375,14.5726639 7.75625,14.5726639 7.5125,14.3196446 Z M5.4,3.18679534 C4.18125,3.18679534 3.125,4.28321231 3.125,5.54830881 C3.125,7.40378368 5.96875,10.6086948 8,12.4641697 C9.70625,10.8617141 12.875,7.57246322 12.875,5.54830881 C12.875,4.19887254 11.81875,3.18679534 10.6,3.18679534 C9.86875,3.18679534 9.1375,3.60849417 8.73125,4.28321231 C8.40625,4.78925091 7.675,4.78925091 7.35,4.28321231 C6.8625,3.60849417 6.2125,3.18679534 5.4,3.18679534 Z">
		</path>
	</symbol>
	<symbol xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 568" id="settings-icon">
		<path d="M487.4 315.7l-42.6-24.6c4.3-23.2 4.3-47 0-70.2l42.6-24.6c4.9-2.8 7.1-8.6 5.5-14-11.1-35.6-30-67.8-54.7-94.6-3.8-4.1-10-5.1-14.8-2.3L380.8 110c-17.9-15.4-38.5-27.3-60.8-35.1V25.8c0-5.6-3.9-10.5-9.4-11.7-36.7-8.2-74.3-7.8-109.2 0-5.5 1.2-9.4 6.1-9.4 11.7V75c-22.2 7.9-42.8 19.8-60.8 35.1L88.7 85.5c-4.9-2.8-11-1.9-14.8 2.3-24.7 26.7-43.6 58.9-54.7 94.6-1.7 5.4.6 11.2 5.5 14L67.3 221c-4.3 23.2-4.3 47 0 70.2l-42.6 24.6c-4.9 2.8-7.1 8.6-5.5 14 11.1 35.6 30 67.8 54.7 94.6 3.8 4.1 10 5.1 14.8 2.3l42.6-24.6c17.9 15.4 38.5 27.3 60.8 35.1v49.2c0 5.6 3.9 10.5 9.4 11.7 36.7 8.2 74.3 7.8 109.2 0 5.5-1.2 9.4-6.1 9.4-11.7v-49.2c22.2-7.9 42.8-19.8 60.8-35.1l42.6 24.6c4.9 2.8 11 1.9 14.8-2.3 24.7-26.7 43.6-58.9 54.7-94.6 1.5-5.5-.7-11.3-5.6-14.1zM256 336c-44.1 0-80-35.9-80-80s35.9-80 80-80 80 35.9 80 80-35.9 80-80 80z" />
	</symbol>
	<symbol xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" id="plus-icon">
		<path fill-rule="evenodd" clip-rule="evenodd"
				d="M12 2C6.48 2 2 6.48001 2 12C2 17.52 6.48 22 12 22C17.52 22 22 17.52 22 12C22 6.48001 17.52 2 12 2ZM11 7V11H7V13H11V17H13V13H17V11H13V7H11ZM4 12C4 16.41 7.59 20 12 20C16.41 20 20 16.41 20 12C20 7.59 16.41 4 12 4C7.59 4 4 7.59 4 12Z" />
	</symbol>
	<symbol xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" id="bookmark-icon">
		<path fill-rule="evenodd" clip-rule="evenodd"
				d="M7 3H17C18.1 3 19 3.89999 19 5V21L12 18L5 21V5C5 3.89999 5.90002 3 7 3ZM12 15.82L17 18V5H7V18L12 15.82Z" />
	</symbol>
	<symbol xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 570" id="user-icon">
		<path d="M313.6 304c-28.7 0-42.5 16-89.6 16-47.1 0-60.8-16-89.6-16C60.2 304 0 364.2 0 438.4V464c0 26.5 21.5 48 48 48h352c26.5 0 48-21.5 48-48v-25.6c0-74.2-60.2-134.4-134.4-134.4zM400 464H48v-25.6c0-47.6 38.8-86.4 86.4-86.4 14.6 0 38.3 16 89.6 16 51.7 0 74.9-16 89.6-16 47.6 0 86.4 38.8 86.4 86.4V464zM224 288c79.5 0 144-64.5 144-144S303.5 0 224 0 80 64.5 80 144s64.5 144 144 144zm0-240c52.9 0 96 43.1 96 96s-43.1 96-96 96-96-43.1-96-96 43.1-96 96-96z" />
	</symbol>
</svg>




<div class="support">
	<a href="https://twitter.com/DevLoop01" target="_blank"><i class="fab fa-twitter-square"></i></a>
	<a href="https://dribbble.com/devloop01" target="_blank"><i class="fab fa-dribbble"></i></a>
</div>
!

CSS 

              
                :root {
	--background: #cecece;
	--scale: 1;
	--icon-size: 24px;
}

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

body {
	width: 100%;
	height: 100vh;
	display: flex;
	justify-content: center;
	align-items: center;
	background: var(--background);
	overflow: hidden;
}

nav {
	position: relative;
	width: 350px;
	height: 80px;
	display: grid;
	grid-template-columns: repeat(5, 1fr);
	border-radius: 10px;
	padding: 0 15px;
	background: rgb(0, 0, 0);
	box-shadow: 0 6.7px 5.3px rgba(0, 0, 0, 0.12), 0 22.3px 17.9px rgba(0, 0, 0, 0.08), 0 100px 80px rgba(0, 0, 0, 0.04);
	overflow: hidden;
	ul {
		height: 100%;
		display: flex;
		justify-content: center;
		align-items: center;
		li {
			list-style: none;
			width: var(--icon-size);
			height: var(--icon-size);
			a {
				display: block;
				width: 100%;
				height: 100%;
				cursor: pointer;
				svg {
					fill: #fff;
					width: 100%;
					height: 100%;
					opacity: 0.4;
					transition: opacity 100ms ease;
					pointer-events: none;
				}
				&.active {
					svg {
						opacity: 1;
					}
				}
			}
		}
	}
	.tubelight {
		position: absolute;
		left: 0px;
		top: 0px;
		transform: translateX(-50%);
		width: 45px;
		height: 5px;
		border-radius: 5px;
		background: #ffffff;
		transition: left 400ms ease;
		z-index: 10;
		.light-ray {
			position: absolute;
			left: -30%;
			top: 5px;
			width: 160%;
			height: 80px;
			clip-path: polygon(5% 100%, 25% 0px, 75% 0px, 95% 100%);
			background: linear-gradient(to bottom, rgba(255, 255, 255, 0.3) -50%, rgba(255, 255, 255, 0) 90%);
			pointer-events: none;
		}
	}
}


.support{
	position: fixed;
	right: 10px;
	bottom: 10px;
	padding: 10px;
	display: flex;
	a{
		margin: 0 10px;
		color: #222;
		font-size: 1.8rem;
		backface-visibility: hidden;
		transition: all 150ms ease;
		&:hover{
			transform: scale(1.1);
		}
	}

}
!

JS 

              
                console.clear();

const uls = document.querySelectorAll("nav ul");
const links = [...document.querySelectorAll("nav a")];
const light = document.querySelector("nav .tubelight");

let activeIndex = 0;
let currentIndex = 0;
let increment = 1;
links.forEach((link, index) => {
	if (links[index].classList.contains("active")) {
		light.style.left = `${links[index].offsetLeft + light.offsetWidth / 4}px`;
	}

	link.addEventListener("click", e => {
		activeIndex = index;
		let t = setInterval(() => {
			if (activeIndex > currentIndex) increment = 1;
			else if (activeIndex < currentIndex) increment = -1;
			currentIndex += increment;

			links[currentIndex].classList.add("active");
			if (currentIndex != -1) links[currentIndex - increment].classList.remove("active");

			if (currentIndex == activeIndex) {
				e.target.classList.add("active");
				increment = 0;
				clearInterval(t);
			}
		}, 50);
		light.style.left = `${e.target.offsetLeft + light.offsetWidth / 4}px`;
	});
});
!
999px

Console