Gui Repositioning problem?

I'm trying to get my code to when the Roblox application window is resized, the Gui frame will stay in the same area, at the bottom right of the screen. The code also includes a part where as soon as the application starts up, it moves the frame.But, if the window is resized, the Gui position dosent change. My frames size is 200, 300

local backgrounds = script.Parent.HomeScreen
local mode = script.Parent.Mode
local rPhone = script.Parent
local int1
local int2



repeat wait()until rPhone.AbsoluteSize.X > 0 and rPhone.AbsoluteSize.Y > 0

if int1 ~= rPhone.AbsoluteSize.X - 200 and int2 ~= rPhone.AbsoluteSize.Y -300 then
	int1 = rPhone.AbsoluteSize.X - 200
	int2 = rPhone.AbsoluteSize.Y - 300
	backgrounds.Position = UDim2.new(0, int1, 0, int2)
end

Use screens instead of pixels

pos = UDim2.new(0.2,0,0.3,0)