css cjuidialog on yii

Question

I'm trying to give a style to my cjuidialog on yii. I've got this into the cjuidialog:

 <link rel="stylesheet" href="/css/survey/style.php">

The problem is that this style affects to the entire page. How can I give a style only to the dialog?

 <?php $this->beginWidget('zii.widgets.jui.CJuiDialog', array(
        'id'=>'previewdialog',
        // additional javascript options for the dialog plugin
        'options'=>array(
            'title'=>'Template Preview',
            'autoOpen'=>false,
            'draggable'=>true,
            'modal'=>false,
            'width'=>900,
        )
    ));

    echo 'Preview';

    $this->endWidget('zii.widgets.jui.CJuiDialog');?>

Thanks,