Reply To: How do I remove Description & Additional Information

It is better to use and add modifications in your child theme files – finctions.php and style.css.

According to me it is better to use function but if you want to do it with css code than add this to your chid theme style.css or in theme setting custom css section:

.tabs-layout-tabs .tabs li.description_tab,.tabs-layout-tabs .tabs li.additional_information_tab{display:none !important}