Hide Sidebar on Brand Pages

I haven’t been able to figure out how to hide the sidebar on all brand related pages. The brand pages want to use my themes default, which i can’t change just to accommodate this plugin. Is there a special class i can add to my custom css to hide it?

I tried this:

.pwb-brand .x-sidebar {
display: none;
}

but I’m guessing i just made up pwb-brand and it’s not an actual class.

The page I need help with: [log in to see the link]