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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 w3-animate-opacity"> <h1>Animation is Fun!</h1> <p>The w3-animate-opacity class fades in an element (0% to 100% opacity in 1.5 seconds).</p> <img src="img_car.jpg" alt="Car" style="width:100%"> </div> </body> </html>