If you want to customize WooCommerce you will need to find a developer for that. Sure it is not working you are trying to place PHP functions into CSS field. It may destroy your site at all.
Try to find a plugin, often plugins do not require developer skills.
Hi Elise, It is very disappointing that in order to HIDE product tabs (very simple task) need to find a developer, this is inadmissible for a Premioum theme,
I need to solve the request