How can you make a screen like one in Warm Isolation?

Hi, for the past few days ive been trying to work on a screen which when you sit down on a chair, will open up a ScreenGUI that should be in the same area as the screen. The only problem is, when testing with different screen sizes its not positioned in the same area. Anyone have an idea how i can get this to work?

You can use this plugin to set the position and size the same to all devices:

https://web.roblox.com/library/1496745047/AutoScale-Lite