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<html lang="en"><head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script></head><body><div class="container"> <h2>Alerts</h2> <div class="alert alert-success"> <strong>Success!</strong> This alert box could indicate a successful or positive action. </div> <div class="alert alert-info"> <strong>Info!</strong> This alert box could indicate a neutral informative change or action. </div> <div class="alert alert-warning"> <strong>Warning!</strong> This alert box could indicate a warning that might need attention. </div> <div class="alert alert-danger"> <strong>Danger!</strong> This alert box could indicate a dangerous or potentially negative action. </div></div>