Since you confirm that removing that code will make all backgrounds transparent, I suggest you do that. Then write custom css for all categories that you want to have a white background. For example, category-news
background-color: #ffffff !important;
Sorry, I do not have a solution to isolate category-links and make it transparent.
I don’t think we are in the same time zone, it is difficult for me to wait for you to publish that post again. I suggest you hire a developer in your time zone if you require further assistance.