<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container"> <div class="row"> <form class="form-horizontal"> <fieldset> <!-- Form Name --> <legend>sample reply form</legend> <!-- Textarea --> <div class="form-group"> <div class="col-md-12"> <textarea class="form-control" id="textarea" name="textarea" cols="30" rows="5" placeholder="default text"></textarea> </div> </div> <!-- Button --> <div class="form-group"> <div class="col-md-4"> <button id="singlebutton" name="singlebutton" class="btn btn-info">reply</button> </div> </div> </fieldset> </form> </div> </div>