<!DOCTYPE html>
<html>
<head>
<style>
ul {
list-style-type: none;
margin: 0;
padding: 0;
width: 200px;
background-color: #f1f1f1;
border: 1px solid #555;
}
li a {
display: block;
color: #000;
padding: 8px 16px;
text-decoration: none;
}
li {
text-align: center;
border-bottom: 1px solid #555;
}
li:last-child {
border-bottom: none;
}
li a.active {
background-color: #4CAF50;
color: white;
}
li a:hover:not(.active) {
background-color: #555;
color: white;
}
</style>
</head>
<body>
<h2>Vertical Navigation Bar</h2>
<p>In this example, we center the navigation links and add a border to the navigation bar.</p>
<ul>
<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>
</body>
</html>