Check out this thread for the details: https://www.access-programmers.co.uk/forums/threads/new-forum-feature-post-voting-and-best-answer.314134/

This new feature looks great to me! :)

Go for the default (light) theme, Shades of Grey or Shades of Blue. I just added the Blue one.

The thread about it is here: https://www.access-programmers.co.uk/forums/threads/new-forum-theme-shades-of-blue.314136/