Tryit Editor v2.9

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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="../lib/w3.css">
<body 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-btn">Button</button>
  <div id="Demo" class="w3-dropdown-content w3-card-4">
    <a href="tryit.asp-filename=tryw3css_ref_dropdown_click.html#">Link 1</a>
    <a href="tryit.asp-filename=tryw3css_ref_dropdown_click.html#">Link 2</a>
    <a href="tryit.asp-filename=tryw3css_ref_dropdown_click.html#">Link 3</a>
  </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>