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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><div class="w3-container"><h2>Closing Alerts</h2><p>To close the alerts, click on the X in the upper right corner:</p><div class="w3-panel w3-red w3-display-container"> <span onclick="this.parentElement.style.display='none'" class="w3-button w3-large w3-display-topright">×</span> <h3>Danger!</h3> <p>Red often indicates a dangerous or negative situation.</p></div><div class="w3-panel w3-yellow w3-display-container"> <span onclick="this.parentElement.style.display='none'" class="w3-button w3-large w3-display-topright">×</span> <h3>Warning!</h3> <p>Yellow often indicates a warning that might need attention.</p></div><div class="w3-panel w3-green w3-display-container"> <span onclick="this.parentElement.style.display='none'" class="w3-button w3-large w3-display-topright">×</span> <h3>Success!</h3> <p>Green often indicates something successful or positive.</p></div><div class="w3-panel w3-blue w3-display-container"> <span onclick="this.parentElement.style.display='none'" class="w3-button w3-large w3-display-topright">×</span> <h3>Info!</h3> <p>Blue often indicates a neutral informative change or action.</p></div></div></body></html>