intensity:=50 ; just a number
Gui, 1: Default
Gui, Color, 0x000000 ; Color to black
Gui, +LastFound +AlwaysOnTop -Caption +E0x20 ; Click through GUI always on top.
WinSet, Transparent, %Intensity% ; Set intensity first based on the time of dday
Gui, Show, x0 y0 w%A_ScreenWidth% h%A_ScreenHeight% ; Cover entire screen