How do I check if someone has Fullscreen Enabled?

Hello. So, I made a GUI/Script to change the Color of the Top GUI. But, when I change the size of the screen or go into Fullscreen, it looks like the Y-Scale moves. How do I fix this? I was thinking of checking if the user has Fullscreen Enabled, but if there is another/better way, please tell me.

Nevermind. I got it now. I used Scale, not Offset.

As a solution to this question, regardless of intent (As people may want to know), you can check ScreenGui.AbsoluteSize - If it's a perfect standard screen size, then they're likely to be in fullscreen (1280x720; 1440x900; 1920x1080 etc)