How To Edit Forum Width?

[PR0TENTIAL]

I would like to edit the above so it's not nearly as wide as that. I imported this style from a friend and I want to customize it to my liking, but the sidebar is below this because the forum width is too much.

 

[Jake Bunce]

The width is controlled by this property:

Admin CP -> Appearance -> Style Properties -> General -> Page Width Controller

Note the Fixed example in the Misc section on that page. Use code like this if you want a fixed width:

width: 750px;
margin: auto;

 

[dewanita]

The width is controlled by this property:

Admin CP -> Appearance -> Style Properties -> General -> Page Width Controller

Note the Fixed example in the Misc section on that page. Use code like this if you want a fixed width:

width: 750px;
margin: auto;

im using 1.5
with this way, how to make it not changing smartphone view?

Thank