Hi Harry,
my name is Erik not Jon Kristen (topic starter), I have still a year of support 🙂
In Claue > Theme Option > WooCommerce > General Setting I have added no image and full transparency. Adding the above code (.page head) does alter the background of every category header into the colour specified in the code, however it also hides all category images that I have uploaded. How can I make the category images visible, and when no image is specified have the header appear in the colour that I enter in the .page head code?
Thanks again, Erik