<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.vertical-menu {
width: 200px;
}
.vertical-menu a {
background-color: #eee;
color: black;
display: block;
padding: 12px;
text-decoration: none;
}
.vertical-menu a:hover {
background-color: #ccc;
}
.vertical-menu a.active {
background-color: #4CAF50;
color: white;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
</head>
<body>
<h1>Vertical Menu</h1>
<div class="vertical-menu">
<ul>
<li class="active-class"><a href="#">Home</a></li>
<li class="active-class"><a href="#" class="active">Link 1</a></li>
<li class="active-class"><a href="#">Link 2</a></li>
<li class="active-class"><a href="#">Link 3</a></li>
<li class="active-class"><a href="#">Link 4</a></li>
</ul>
</div>
<script>
$(document).ready(function(){
$(".active-class a").click(function() {
$(".active-class a").removeClass("active");
$(this).addClass("active");
});
});
</script>
</body>
</html>