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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/4/w3.css"><body><div class="w3-container"> <h2>Clickable Dropdown</h2> <p>Click on the button to open the dropdown menu.</p> <div class="w3-dropdown-click"> <button onclick="myFunction()" class="w3-button w3-black">Click Me!</button> <div id="Demo" class="w3-dropdown-content w3-bar-block w3-border"> <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></div><script>function myFunction() { var x = document.getElementById("Demo"); if (x.className.indexOf("w3-show") == -1) { x.className += " w3-show"; } else { x.className = x.className.replace(" w3-show", ""); }}</script></body></html>