<ul>
	<li><a href="#">nav</a></li>
	<li><a href="#">nav</a></li>
	<li><a href="#">nav</a></li>
	<li><a href="#">nav</a></li>
	<li><a href="#">nav</a></li>
</ul>
body {
	display: flex;
	justify-content: center;
	align-items: center;
	height: 100vh;
}
ul {
	display: flex;
	margin: 0;
	padding: 0;
	border: 1px solid #ccc;
	border-radius: 4px;
	list-style: none;
}
ul li {
	width: 20%;
}
ul li:not(:first-child) {
	border-left: 1px solid #ccc;
}
ul li a {
	display: block;
	padding: 1em 3.5em;
	color: #333;
	font: 400 18px/1 'Open Sans', sans-serif;
	text-decoration: none;
	text-align: center;
	transition: .3s;
}
ul:hover li a {
	opacity: .3;
}
ul li a:hover {
	opacity: 1;
}
Run Pen

External CSS

  1. https://fonts.googleapis.com/css?family=Open+Sans

External JavaScript

This Pen doesn't use any external JavaScript resources.