<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="main"> <div class="row"> <h2><form class="form-horizontal"> <fieldset> <!-- Form Name --> <legend>Ingresar</legend> <!-- Text input--> <div class="form-group"> <label class="col-md-4 control-label" for="user">Usuario</label> <div class="col-md-4"> <input id="user" name="user" type="text" placeholder="placeholder" class="form-control input-md" required=""> </div> </div> <!-- Password input--> <div class="form-group"> <label class="col-md-4 control-label" for="password">Clave</label> <div class="col-md-4"> <input id="password" name="password" type="password" placeholder="placeholder" class="form-control input-md" required=""> </div> </div> <!-- Button --> <div class="form-group"> <label class="col-md-4 control-label" for="enter_button"></label> <div class="col-md-4"> <button id="enter_button" name="enter_button" class="btn btn-primary">OK</button> </div> </div> </fieldset> </form></h2> </div> </div>