<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 ----------> <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>