Phantom Header Image

I am using the Di Multipurpose theme and when customizing, it looks close to how I want it to look, but after publishing, there is a header image that I have not enabled with this theme, so I don’t see a way to remove it. I had used this image with one of the first themes I ever used, but not for a while. I’m guessing I will need to edit the code for this, but I haven’t been able to find it. When I view the source of the page, I can see where the image is in the HTML, but I can’t find how to edit the CSS to remove that image. Any help would be appreciated.

The page I need help with: [log in to see the link]