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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>Hoverable Image</h2> <p>The w3-hover-opacity class adds transparency to the image when you move the mouse over it:</p> <img src="img_fjords.jpg" class="w3-hover-opacity" alt="Norway" style="width:50%"> </body> </html>