Basic Side Column Widget Width Question

I’m trying to minimize some white space on VUhoops.com

I’ve played, I’ve tinkered. All to no avail.

I think this is a basic question, but where do I update in the CSS for the following changes (and I apologize for using incorrect terms).

A. I would like to extend the left sidebar to extend to the far left of the container. I’m assuming that the width is the length of the Widget Title Underlining (So it would line up with the Header Underline.

B. I would like to do the same with the right hand sidebar
B-1. How do I extend that widget sizing of the right-hand side to extend farther out to the edge?

Thanks so much for your patience and assistance.