My 1:1 aspect ratio 720p vertical arcade bezels for Retroarch. There are bezels with included scanlines and ones without to use with your own filters/shaders.
Originally created for the Powkiddy RGB30.
Open game and then go to the Quick Menu for Retroarch (Select + X buttons) > On-Screen Overlay > Overlay Preset > Choose cfg file. Save the override on a per game basis. For more info on setting up the RGB30, I highly recommend the Retro Game Corps Starter Guide.