CSS

I asked for help making the expanded images fully expand here. They got something workable, but it gets rid of the sidebar. I'm hoping for something where the image just covers the sidebar.

I found the class, but I don't know how to write the CSS to make it go all the way across the screen regardless of the parent. So it would start with .img-expanded:not(.banner):not(.avatar-overlay) { } but I need to know what goes in the brackets.