<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/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"> <h2>Bootstrap 3 input group and wells</h2> <div class="input-group input-group-lg"> <span class="input-group-addon" id="sizing-addon1">@</span> <input type="text" class="form-control" placeholder="Username" aria-describedby="sizing-addon1"> </div> <br> <br> <div class="well">Hey look, I'm a bootstrap 3 well .</div> </div>