Subforums appearence

Hello everyone

I'm working on implementing a Punbb forum. In this project I will need sub-forums.

The big big question is that the default appearance provided by extension sub-forums does not fit the design of my project.

Looking for more on the subject, I find a forum that uses punbb that looks the way I need.

The question is: how do you make sub-forums look like the one you see at Jediru Forums?

Thank you all for your attention.