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<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<body>
<div class="w3-container w3-rightbar w3-pale-green w3-border-green">
  <h2>Rightbar</h2>
  <p>The w3-rightbar class adds a thick right border (bar) to an element.</p>
</div>
</body>
</html>