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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/4/w3.css">
<body class="w3-container">
<h2>Display Alerts</h2>
<p>The w3-panel class can be used to display alerts:</p>
<div class="w3-panel w3-pale-red w3-border">
  <h3>Danger!</h3>
  <p>Red often indicates a dangerous or negative situation.</p>
</div>
<div class="w3-panel w3-red">
  <h3>Danger!</h3>
  <p>Red often indicates a dangerous or negative situation.</p>
</div>
</body>
</html>