Align logo, header image, header sidebar

I just upgraded Simple Catch Pro from version 2.x to 3.9.2. In the previous version, I had the header image positioned behind (as a background to) the logo and header right sidebar. With the upgrade, the settings for the header image and logo were removed, and the header sidebar was moved to the footer. After resetting these, I can't figure out how to get the header image to position as the background to the other header elements. The site is arokismusic.org. There is some existing custom CSS that carried over from the previous version of the theme. It's possible that it needs to be updated for the updated theme.