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<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 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>