Deleting the sidebar in CoursePress Pro

Hi there,
I'd had a search on your forums and I tried adding the plugin Simple Custom CSS and using the following code to delete the sidebar on CoursePress Pro:

.cp_storyboard #sidebar,
.page-id-0 #sidebar {display: none;}

It didn't work...

What do you suggest instead?

I am not using a WPMU theme, I'm using Finch by Thommus Rhodus which comes with its own page builder:

I tried to create a child theme, but couldn't get it to look right.

Here are the CoursePress test page links: