<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//netdna.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <form class="form-horizontal"> <fieldset> <!-- Form Name --> <legend>Buscar una ficha</legend> <!-- Select Basic --> <div class="form-group"> <label class="col-md-4 control-label" for="buscaAlumno">Alumno</label> <div class="col-md-6"> <select id="buscaAlumno" name="buscaAlumno" class="form-control"> <option value="1">Option one</option> <option value="2">Option two</option> </select> </div> </div> </fieldset> </form>