Its a default function from 3.6.x
Create a new style and then go to
ADMINCP - FORUMS & MODERATORS - FORUM MANAGER
Select the forum you want to give a seperate style and then
Set Custom Style for this Forum to whatever you want and then select
Override Users' Style Choice YES
No matter what the default board style is or what the user set in his settings, if he/she enters this forum the set style will show up
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