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HTML

About HTML Preprocessors

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.

!
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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Packages

Add Packages

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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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