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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://www.rocschool.com/public/static/w3css/4/w3.css"> <body> <div class="w3-container"> <h2>Panels for Alerts</h2> <p>The w3-panel class can be used to display alerts:</p> <div class="w3-panel w3-red"> <h3>Danger!</h3> <p>Red often indicates a dangerous or negative situation.</p> </div> </div> </body> </html>