Hi,
Sorry if this is a dumb question but ...
Some windows in my Stretch installation look strange/old fashioned. See links below for comparison with the look under Jessie. I guess I just need to install some GTK+younameit, Which library/package could be responsible for it?
Jessie: https://ibb.co/ehxwNm
Stretch: https://ibb.co/hUxKa6
Thanks
Mr