(If its possible) Add "overlays"

I am going straigth to it, i dont like very much the black bars that show when playing with the screen fliped to horizontal, so theres my suggestions ### (Sorry if i have bad english) **My solution** Add overlays at the sides of the screen based on the plataform that is reproducing (Like some resembling to the Super Nintendo if playing its games) , and if you want to do something similar but when the screen is vertical, please make something similar to the Pizza Boy emulators, with the background being its own thing separated from the touch controls. **Some less harder alternatives** Simply let customize the colors that are the bars (like giving some colors like red, pink, orange, green etc) **Some basses** Heres examples of my idea (originally made for retroarch by Orionsangel, i didnt ask for permison in case of). https://youtu.be/ZTD5aseEliQ?si=vFhrf4f1-A7H87XE (SNES example) https://youtu.be/Vlm-0jpyyss?si=_1nj8eGKXmVv6AlU (NES example) https://youtu.be/qzaycpBzmG4?si=GyUQZD--g1b7417k (Genesis example) (The examples were taken from LibRetro)