<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="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <p class="flex-containe"> <a role="button" href="#" data-toggle="modal" class="btn btn-lg btn-primary" data-target="#myModal" role="button">Launch Demo Modal</a> </p> <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel"> <div class="modal-dialog modal-smll" role="document"> <div class="modal-content"> <div class="modal-header bg-primary text-center"> <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button> <h2 class="modal-title" id="myModalLabel">Subscribe to our Newsletter.</h2> <p>We promise we will not spam you.</p> </div> <div class="modal-body"> <div class="row"> <form action="#"> <div class="form-group col-md-12"> <div class="input-group"> <span class="input-group-addon">@</span> <input type="email" class="form-control input-lg" placeholder="Your email here"> </div> </div> <div class="form-group col-md-12"> <input type="submit" class="btn btn-primary btn-lg btn-block" value="Subscribe"> </div> </form> </div> </div> </div> </div> </div>

.input-group-addon, input[type=email], input[type=submit], .modal-content{border-radius:0px}