White window frames on non gtk4 flatpak apps

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1

When i for example run element or discord i have white window frames

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2

it is using gtk 3. this is normal.

3

Can i use some kind of dark theme for this?

4

0k i found GitHub - lassekongo83/adw-gtk3: The theme from libadwaita ported to GTK-3
that should be installed by default