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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"><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"><body><div class="w3-sidebar w3-bar-block w3-light-grey w3-card" style="width:30%"> <a href="#" class="w3-bar-item w3-button">Link 1</a> <a href="#" class="w3-bar-item w3-button">Link 2</a> <div class="w3-dropdown-hover"> <button class="w3-button">Dropdown <i class="fa fa-caret-down"></i> </button> <div class="w3-dropdown-content w3-bar-block"> <a href="#" class="w3-bar-item w3-button">Link</a> <a href="#" class="w3-bar-item w3-button">Link</a> </div> </div> <a href="#" class="w3-bar-item w3-button">Link 3</a> </div><div style="margin-left:30%"><div class="w3-container"><h2>Dropdown in Sidebar</h2><p>In this example, we have added a dropdown menu inside the sidebar.</p><p>Notice the caret-down icon, which we use to indicate that this is a dropdown menu.</p></div></div> </body></html>