hi everyone, as the title already says, GTK4 app e.g. Dino does not follow plasma theme,
I did try everything incl. Google search.
anyone an idea to help me out, this stubborn window is not so important
yet very annoying 
Would this be of any help to you?: Uniform look for Qt and GTK applications - ArchWiki
Thanks for the link, I have tried all of them, but they are not explicitly talking about GTK4,
but yes I have tried and had no luck so far …
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thanks, somehow I got it solved, so I installed some GTK-4.0 Themes:
Went to the .themes folder
chose one of the gtk4 theme folder,
inside the theme folder opened the gtk-4.0 , and
copied the content into the emptied folder
.config/gtk-4.0
This is it, maybe need to restart the GTK4 app but not the system
… I installed also Colloid themes, but I could not find the folder where they are in
It should be in /usr/share/themes
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you are right, I just remember now, I
did cut back on AUR-packages
for a healthy and flat system,
thank you so much for your help