<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 ----------> <div class="container"> <div class="card">...</div> <div class="card card-primary">...</div> <div class="card card-secondary">...</div> <div class="card card-success">...</div> <div class="card card-info">...</div> <div class="card card-warning">...</div> <div class="card card-danger">...</div> <div class="card card-dark">...</div> </div>