yii2 form表单样式怎么设置？或者说在哪里写样式？

<?= $form->field($model, 'email') ?>
像这种，样式怎么设置？

http://blog.csdn.net/iefreer/article/details/42651521

学习中！大神指点 http://blog.csdn.net/iefreer/article/details/42651521