<!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>W3.CSS Modal Image</h2>
<p>Click on the image to display it in full size:</p>
<img src="img_snowtops.jpg" style="width:30%;cursor:zoom-in"
onclick="document.getElementById('modal01').style.display='block'">
<div id="modal01" class="w3-modal" onclick="this.style.display='none'">
<span class="w3-button w3-hover-red w3-xlarge w3-display-topright">×</span>
<div class="w3-modal-content w3-animate-zoom">
<img src="img_snowtops.jpg" style="width:100%">
</div>
</div>
</div>
</body>
</html>