Modify style.css for Sub-Menu Position

Hi all,
I need some help here. I have been try back and forth, but still can not found it.

I try to make the sub-menu on “LANGUAGE” main menu at http://byrobot.co.kr/kor/drone-fighter
to be positioned as same as at
http://byrobot.co.kr/kor/

How to do that..?

Thanx in advance.