For Gameboy or portable device emulation, i want to add a bezel of the emulated machine around the game screen because i want to emulate resolution in 1:1 and i have black border all around the screen ( see example attached). I use mainly MEDNAFEN for GB,GBC or GBA emulation and i don't have found such option for this emulator I know that Rocket launcher is able to add bezel in overlay of the emulator. Can i do the same thing in Gameex or with Mednafen itself ? Thanks