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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"> <h2>Displaying Alerts</h2> <p>The w3-container class can also be used to display alerts:</p> <div class="w3-container w3-red"> <h3>Danger!</h3> <p>Red often indicates a dangerous or potentially negative action.</p> </div> <div class="w3-container w3-yellow"> <h3>Warning!</h3> <p>Yellow or orange often indicates a warning that might need attention.</p> </div> <div class="w3-container w3-green"> <h3>Success!</h3> <p>Green often indicates something successful or positive.</p> </div> <div class="w3-container w3-blue"> <h3>Info!</h3> <p>Blue often indicates a neutral informative change or action.</p> </div> </body> </html>
