Fix Checkout Page, Shopping Cart Page, Account Pages, etc.

I just started using your theme and there seems to be an issue with the Checkout Page, Shopping Cart Page, Account Pages, other Pages. Please see attached images. They have no color, so it is all transparent and my background shows through. I want the background image to be there along the edges, but these pages should at least have a white background. It is strange that they are Transparent out of the box. How do I fix this?