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<html><title>W3.CSS</title><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="https://www.w3schools.com/w3css/5/w3.css"><body><div class="w3-sidebar w3-bar-block w3-border-right" 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 a w3-border class to add a border to the sidebar.</p></div></div> </body></html>