Modify Default Kobo Header/Book Title Font in Reading Mode

Hi everyone, I've figured out how to modify my footer style using either the Metazoa "Custom reading footer style" or directly modifying the css from my nickel file, but I'd like to also modify my header to match. Does anyone know a way to do this? I've tried modifying various lines of css in my nickel file, but I haven't been able to make anything work.

Ideally, these are the attributes that I'd like to change so that my header matches my footer:

font-family
color
text-transform

Thanks for any help!