<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="row mb-10"> <h2>Create your snippet's HTML, CSS and Javascript in the editor tabs</h2> </div> <div class="container"> <div class="row"> <button type="button" class="btn btn-primary">Primary</button> <button type="button" class="btn btn-secondary">Secondary</button> <button type="button" class="btn btn-success">Success</button> <button type="button" class="btn btn-danger">Danger</button> <button type="button" class="btn btn-warning">Warning</button> <button type="button" class="btn btn-info">Info</button> <button type="button" class="btn btn-light">Light</button> <button type="button" class="btn btn-dark">Dark</button> </div> <div class="row"> <input class="form-control" type="text"> </div> </div> </div>

input[type=text] { border:0; border-radius:0; border-bottom:1px solid #ced4da; }