Individual page edit

Hey guys,
How can I edit the size and style of each forum separately? (And keep it responsive)

For example this forum on my site called “Schooling” I would like to have a custom background, font, color, etc.

https://peopleofthesouth.co.za/bypass (to get past coming soon page)

Forum link:
https://peopleofthesouth.co.za/ValleyFamilyForum/Room/schooling/

Help would be very much appreciated, as I’m on a deadline for launch!

Thanks ??