If you've still got a problem, then I need to know the details of the platform you are running on because there are significant differences in how themes work in gtk3 between < 3.20 and >= 3.20. I'm assuming Ubuntu, so...
lsb_release -a and dpkg -l libgtk-3-0
If you've still got a problem, then I need to know the details of the platform you are running on because there are significant differences in how themes work in gtk3 between < 3.20 and >= 3.20. I'm assuming Ubuntu, so...
lsb_release -a
and
dpkg -l libgtk-3-0