[GNC] UI question

[lj]

John Ralls wrote:
> The Gtk Inspector, https://wiki.gnome.org/Projects/GTK%2B/Inspector
> <https://wiki.gnome.org/Projects/GTK+/Inspector>, is a wonderful way to
> poke and prod a Gtk application’s styling.
OK that helped. Turns out there is an error in the supplied sample CSS file 
share/doc/gnucash/gtk-3.0.css - there is a missing "." before the class  selector.

This, from the file, does not work:
    sheet { font: 18px arial, sans-serif; }

What works is either this:
    .sheet { font: 18px arial, sans-serif; }

or this
    GnucashSheet { font: 18px arial, sans-serif; }