<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<br>
<div class="container">
<div class="alert alert-success">
<strong>Info:</strong> you should do an action.
</div>
<div class="alert alert-danger">
<strong>Danger:</strong> you shouldn't do an action!
</div>
</div>