Create background gradient overlay on page, making the discussion area white

Kris! That worked brilliantly (see image below)! Thanks so much for the quick response!!

One more question… from the best practices and efficiency standpoint, is this the best way to accomplish what I want to do? Is this the most “lightweight” and efficient solution? or would having a static image the doesn’t repeat, or some other solution, be a better way to do what I’m trying to do while using less resources/bandwith, etc?