Photocrati wrapper-content-spacer Location

I am using the Photocrati theme at my site https://www.penelopehedges.photography.

There is a huge space at the top of each page so the main images are partly below the fold and have to be scrolled to.

I believe I have identified wrapper-content-spacer as the offending CSS but I cannot find where this is located to change it. I need to reduce the height to something like 50 px rather than the >200 px currently in place.

Can someone please confirm that I am looking for the correct CSS and also where to find it?