<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="4/w3.css">
<body>
<div class="w3-sidebar w3-bar-block w3-red" style="width:25%">
<a href="#" class="w3-bar-item w3-button">Link 1</a>
<a href="#" class="w3-bar-item w3-button">Link 2</a>
<a href="#" class="w3-bar-item w3-button">Link 3</a>
</div>
<div style="margin-left:25%">
<div class="w3-container w3-dark-grey">
<h1>My Page</h1>
</div>
<div class="w3-container">
<p>Use the w3-color class to change the background color of the sidebar.</p>
<p>If you want an active/current link, to let the user know which page he/she is on, add the w3-color class to one of the links as well.</p>
</div>
</div>
</body>
</html>