About Mega Menu Panel

Hello. I want to add horizontal and vertical lines inside mega menu panel. Also want to add hover effect. It is not good looking for now. Check my mega menu on arzunet please. How can I do this? I want to make like this;

http://sv102.piclect.com/63fbd2693/o/14/09/17/imagepng.jpg

Thanks.

https://wordpress.org/plugins/megamenu/