Hi...I recently purchased a bathroom light to place above my medicine cabinet in the bathroom. I bought it because it was the same length as the top of the med cab. However, the round 4 " electrical box in the wall is off-center by about 1 1/2". The the back of the light housing is open and the housing is made to screw into the cross bar that was supplied with the light. So the light ends up being off-center after it is installed. The electrical box is off-center to the right and the stud that it is nailed to is on it's left...so it can't be moved to the left to center it. Is there a simple way that I can center this light safely without violating code?