MyBB Community Forums

How To make Sub forum like image

[attachment=42696]

My Site Url https://forum.a2zrom.com/

you can try using this method => Link (see also this)

MyBB Templates system | editing theme (simple mode)

Here is another manual with floating elements + media queries for a responsive capability.
https://community.mybb.com/thread-224036.html

[ExiTuS]