Needed help to make multiple Checkbox inline in Cakephp 2

I Want make my multiple Checkbox inline in Cakephp 2. i use "display: inline". but no luck. Here is my code - in App controller-

public $guest = array('1'=>'Yes','2'=>'No');
  public function beforeFilter() {

          $this->set ('guest', $this->guest);

    }

In ctp i write this -

<div class="col-sm-6 col-xs-6 form-group" >

                         <?php
                           echo $this->Form->input('Guest', array('style' => 'float: left; display: inline','type' => 'select', 'multiple' => 'checkbox', 'options' => $guest));
                         ?>

                    </div>

Can i get help?