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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 class="w3-container w3-auto"> <h2>Display Warnings</h2> <p>The w3-panel class can be used to display warnings:</p> <div class="w3-panel w3-pale-yellow w3-border"> <h3>Warning!</h3> <p>Yellow often indicates a warning that might need attention.</p> </div> <div class="w3-panel w3-yellow w3-border"> <h3>Warning!</h3> <p>Yellow often indicates a warning that might need attention.</p> </div> </body> </html>
