Hi there,
I guess this is a real dummy question… and I guess you can help quickly.
My layout in www.hartig-coacht.de is boxed and I have a semi-narrow background right and left. See screenshot.

Now I need a little more width (to provide some space for a new item in navbar). Could you please tell me how to proceed to reduce the width of background? I simply don’t dare to play around with these global settings 
Thank you very much.
Cheers, Karen

