[frostschutz]

Flying blind... does it look any different with this file?

This isn't supposed to fix it in any way, I can not begin to guess the correct values for the Kobo Aura One. This is just to see if it changes the visuals in any way at all, then there might be a chance it could be fixed by just changing CSS.

This is assuming it just looks bad but you can still input numbers and even save/quit/newgame once you find the invisible button for that (lower right corner for me)

There is this nickel css patch thing by user @pipcat, maybe it would also be able to patch css for libsudoku.so so you could experiment.