This behavior makes adding CSS body classes to your layouts quite simple Unpack release in the protected/extensions folder. Then add the behavior to a controller (or even better to your components/Controller.php): public function behaviors() { return array( 'BodyClassBehavior' => array( 'class' => 'ext.BodyClassBehavior.BodyClassBehavior' ), ... ); } In your layouts/main.php view, add to your body tag: ... And you're done! Code in this credit to Artifical and Nick Matthews (see http://www.yiiframework.com/forum/index.php/topic/28849-body-classes-based-on-url/)