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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>Buttons with Ripple Effect</h2> <p>Click on the buttons to see the effect:</p> <button class="w3-btn w3-ripple">Button</button> <button class="w3-btn w3-ripple w3-red">Button</button> <button class="w3-btn w3-ripple w3-yellow">Button</button> </body> </html>