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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> <div class="w3-container w3-center"> <h5>Animations</h5> <h1 class="w3-animate-opacity">w3-animate-opacity</h1> <p>The w3-animate-opacity class fades in an element (opacity from 0 to 1).</p> </div> </body> </html>