How do I reduce the size of the menu bar?

I am trying to make a slim-looking radiance theme. I dont want to switch to linuxmint for slim interfaces, and I like the unity interface more.

I have been able to reduce padding from almost all the file in theme-name/gtk-3/*.css and metacity-1/metacity-theme-1.xml.

I am still not able to find any place/setting where I can reduce the size of the menu bar. I would like to make it thin. Say 3px or 4px thin.

You can see in the below shown picture I have been able to slim the size of windows border, and also a little bit for the toolbar (although I would like to reduce it more). The menu bar is still thick and big.

Please suggest what shall I do, to make it slim ? My Theme files.

• metacity-theme-1.xml
• gtk-widgets-backdrop.css
• gtk-widgets.css
• gtk.css

Solution 1:

I ran

mlocate unity.css 

and saw there are two other css-files:

/usr/share/themes/Ambiance/gtk-3.0/apps/unity.css

/usr/share/themes/Radiance/gtk-3.0/apps/unity.css