So i know about the controls and pixel perfect movement etc, but there's one thing Google is too useless to answer. (Isn't it always useless lately?)

Just how do i get a bar or window dead centered on the middle line?
There's the grid lines on screen BUT they are impossible to focus on so i cant count the squares to ensure dead centered placement.

So is there a way to can move a bar and ensure it is DEAD center on the middle line so i can get my HUD centered perfectly and symmetrical?