This is one of GTK3 problems, I'm very disappointed with them.
See my topic here
for reference.
There is a working method for Human theme on AskUbuntu -
you can try to adjust it for your case
This is one of GTK3 problems, I'm very disappointed with them.
See my topic here
for reference.
There is a working method for Human theme on AskUbuntu -
you can try to adjust it for your case