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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="/lib/bootstrap.min.css"> <script src="/lib/jquery-1.12.2.min.js"></script> <script src="/lib/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>Button</h2> <p>The .btn-danger class indicates a dangerous or potentially negative action:</p> <button type="button" class="btn btn-danger">Danger</button> </div> </body> </html>