<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>
<div class="container">
<div class="row">
<div class="col-md-4">
<input class="form-control input-md" type="text" id="inputData" name="inputData" value="123">
</div>
</div>
<div class="row">
<div class="col-md-4">
<a href="#" id="convert" class="btn btn-sm btn-info"><span class="glyphicon glyphicon-refresh"></span> Convert</a>
</div>
</div>
<div class="row">
<div class="col-md-4">
<textarea class="form-control" id="result" name="textarea" rows="10"></textarea>
</div>
</div>
</div>