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That’s looks like GTK so use CSS i assume?
Can you give some resources on how to do so.
What OS? Maybe something similar to this? https://github.com/NixOS/nixpkgs/issues/119433
@antihero, there's a few different methods that all attack that problem in perty much the same way. The flatpak in question needs to have access to the theme/font/icon pack you want it to use.