Genesis does not make it simple to change the size of the width of its sidebars. What I really want to do is put two rectangle ads at the top of my content within the content section and to do that I need to widen the content section and shrink the sidebar section. You can easily see what I'm talking about here: coeliacdisease.org.
I've seen some posts on this topic, but they aren't right b/c only changing the width of the sidebar does not solve the problem. I think you have to change the width in a few different places in order for it all to readjust and flow correctly.
Thanks for whatever help you can provide!!