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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.w3schools.com/w3css/5/w3.css"> <body> <div class="w3-container w3-danger"> <h2>WARNING</h2> <p>Red often indicates a dangerous or negative situation.</p> </div> </body> </html>
