I commented rich-editor part, because I don’t have that setting, yet edited that, now it should work
But what font-family I should use there? Sure, matter of taste, but if I would like to follow some sound guidelines, and at same time not breaking my forum…
I know basics how to use fonts in CSS, but I don’t know how to tell here ”use same font or font-family as before or what we are using in WYSIWYG mode, please”.