Would recommend a black background Vscode theme for an OLED. The black background with red accents looks beautiful, at least on my smaller XPS 15 4k OLED. I use Dobri Next Black with some customizations but it looks good by default as well.
Correct me if I'm wrong - in OLED monitors, a black pixel actually means a powered off pixel. So it's a good idea to use as much as black in static areas to prolong the monitor life.
