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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="../../maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"> <script src="../../ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="../../cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script> <script src="../../maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script></head><body><div class="container"> <h2>Alerts</h2> <p>Alerts are created with the .alert class, followed by a contextual color classes:</p> <div class="alert alert-danger"> <h3>Danger!</h3> <p>This alert box could indicate a dangerous or potentially negative action.</p> </div> <div class="alert alert-warning"> <h3>Warning!</h3> <p>This alert box could indicate a warning that might need attention.</p> </div> <div class="alert alert-success"> <h3>Success!</h3> <p>This alert box could indicate a successful or positive action.</p> </div>