css fix

Hello, I have a landing page that is based on code from our main website (auto-generated from a vb application). The main website has a background image. That background image is causing the auto-generated landing page to not have a solid page background. I'm attaching a series of images to show the problem, as well as the landing page we need modified. The landing page needs to be modified just using css. This job does not include modifiying our vb program. There is a difficulty in that the landing pages uses a css file from the main site as well as one specifically for the landing page.