This image shows how I’m trying to get it to look like. I was thinking before to have the content of each sidebar to be center-aligned, but I think it might look better with how it looks in the picture (left-aligned and right-aligned). The arrows are to show that the middle content is stretched to fit.
I made this quickly in paint, so it may not be entirely proportionate. The width doesn’t have to be exactly how it is in the picture, but for sidebars to be equal and close to that size. I don’t want that mirror image like it is on the left sidebar, but that was the easiest way I could demonstrate the right-aligned content.