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<!DOCTYPE html>
<html>
<title>W3.JS</title>
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<script src="w3.js"></script>
<body>
<div class="w3-container">
<p><button class="w3-btn w3-green" onclick="w3.toggleShow('#London')">Click to Toggle Hide/Show</button></p>
<div id="London" class="w3-panel w3-red">
  <h2>London</h2>
  <p>London is the capital city of England.</p>
</div>
</div>
</body>
</html>