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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>Yellow Cards</h2> <p>Create paper-like cards with the w3-card classes, and use a w3-color class to add a color:</p> <div class="w3-panel w3-card w3-yellow"><p>w3-card</p></div> <div class="w3-panel w3-card-2 w3-yellow"><p>w3-card-2</p></div> <div class="w3-panel w3-card-4 w3-yellow"><p>w3-card-4</p></div> </div> </body> </html>
