Issues with Quiz Pages on LearnDash – Background image cannot be removed

Help is greatly appreciated here. I use LearnDash and have been able to use Additional CSS to remove some elements that appear on the course pages – Meta, tag cloud, etc. However, I cannot figure out how to remove the background image that is inexplicably showing up on Quiz pages.

In the Emmet Lite customizer I have set the background image (you can see on the homepage) for the big title section. This is what appears to be showing up on the quiz pages.

How can I hide this on quiz pages? Or just what do I add to the CSS.

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