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<html><title>W3.CSS</title><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="https://www.w3schools.com/w3css/5/w3.css"><body><div class="w3-container"> <h2>Button Ripple Effect</h2> <p>Click on the buttons to see the effect.</p> <button class="w3-btn w3-black w3-ripple">Button</button> <button class="w3-btn w3-ripple w3-teal">Button</button></div></body></html>