XF 1.1 options for users to have forums fluid or fixed?

[Lawless Baron]

I want to insert a code at the bottom of my Xenforo site so that if users don't like Fluid they can have Fixed or the other way around is there anyway to do this?

 

[Jake Bunce]

Normally you would just create another style that is a different width. Then users can select the style they want. If the two styles are to be identical except for their widths then create the new style as a child of the current style. Then change the width for the new style. Everything else will inherit from the parent.

 

[Lawless Baron]

this didnt even cross my mind thankyou

EDIT:
is there anyway to have it so any changes i make to the Adult Theme applies to the Child theme