Hi,
The category image is showing on a product listing* if you configure it to do so.
So, edit the menu item (must be of type "category listing"), tab "Categories Options", section "Data display", and set option "Show image" to "No", then save.
See the documentation:
www.hikashop.com/support/documentation/i...ront-end.html#Imenus
(scroll down to "Data display")
You'll then be able to remove your CSS modification again. (By the way, do not edit the core CSS files directly, they'll be overwritten on update and your changes will be lost. Instead follow the procedure for custom CSS as described
here in the documentation
.)
* Just FYI and to avoid confusion now or in the future: the term "product page" is typically used for the product "detail" page, while you're here referring to a product listing.