Update issues with navigation

I still cannot get the arrows on the main image. It’s only showing on the thumbnails. I also have an issue with thumbnail navigation; on chrome, the previous arrow is hidden behind the thumbnails. I’ve tried fixing it and can’t. If you manually move the slider you can see the previous arrow behind the thumbnail slider.

In Firefox; it displays above the thumbnails; however, only the previous button and not the next.

The page I need help with: [log in to see the link]