<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-sm-4">
<div class="form-search" style="width:auto;>
<div class="input-append"">
<select class="form-control col-sm-4">
<option>1 </option>
<option>2</option>
<option>3</option>
<option>3</option>
<option>4</option>
<option>6</option>
</select>
<button type="submit" class="btn btn-primary">Search</button>
</div>
</div>
</div>
</div>
</div>
