<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<h2>Unauthorized</h2>
<hr>
<h5>We could not verify that you are authorized to access this webpage. You could of supplied the wrong credentials (e.g., bad password), or your browser doesn't understand how to supply the credentials required.</h5>