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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">
<h2>Responsive Bar</h2>
<p>The <strong>w3-mobile</strong> class is perfect for smaking bar items responsive.</p>
<p>Resize the window to see the effect:</p>
<div class="w3-bar w3-black">
  <a href="#" class="w3-bar-item w3-button w3-mobile">London</a>
  <a href="#" class="w3-bar-item w3-button w3-mobile">Paris</a>
  <a href="#" class="w3-bar-item w3-button w3-mobile">Tokyo</a>
</div>
</div>
</body>
</html>