<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>
<div class="container">
<div class="row">
<form class="form-horizontal">
<fieldset>
<legend>sample reply form</legend>
<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>
<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>
