The issue has been fixed now for version 3.5. If you are using this version you can update your plugin and this functionality will work. Here is a video on how to update a Nop Templates Theme. If you are using older versions of nopCommerce I will provide you with the css code that will resolve this issue.
Would it be possible for you to submit a ticket about this issue from My Account / New Ticket. This way it would be easier for me to send you the file you need to replace, because in the forums I'm not able to send files.