<ul class="sidenav">
	<li><a class="active" href="#home">Home</a></li>
	<li><a href="#news">News</a></li>
	<li><a href="#contact">Contact</a></li>
	<li><a href="#about">About</a></li>
</ul>

ul.sidenav {
	list-style-type: none;
	margin: 0;
	padding: 0;
	width: 200px;
	background-color: #f1f1f1;
	position: relative;
	overflow: auto;
}
ul.sidenav li a {
	display: block;
	color: #000000;
	padding: 8px 16px;
	text-decoration: none;
}
ul.sidenav li a.active {
	background-color: #da3c41;
	color: white;
}
ul.sidenav li a:hover:not(.active) {
	background-color: #1b2538;
	color: white;
}
div.content {
	margin-left: 25%;
	padding: 1px 16px;
	height: 1000px;
}
@media screen and (max-width: 900px) {
	ul.sidenav {
		width: 100%;
		height: auto;
		position: relative;
	}
	ul.sidenav li a {
		float: left;
		padding: 15px;
	}
	div.content {
		margin-left: 0;
	}
}
@media screen and (max-width: 480px) {
	ul.sidenav li a {
		text-align: center;
		float: none;
	}
}