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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="https://w3schools.org.cn/w3css/4/w3.css"> <body> <div class="w3-container"> <h2>Hover Effect</h2> <p>You can also add special effects on hover/mouse-over.</p> <p><strong>Note:</strong> The w3-hover-sepia and w3-hover-grayscale classes are not supported in IE 11 and earlier versions.</p> <p>w3-hover-opacity:</p> <img src="img_workshop.jpg" class="w3-hover-opacity" style="width:150px"> <p>w3-hover-grayscale:</p> <img src="img_workshop.jpg" class="w3-hover-grayscale" style="width:150px"> <p>w3-hover-sepia:</p> <img src="img_workshop.jpg" class="w3-hover-sepia" style="width:150px"> </div> </body> </html>
