Thanks for you CodePen. I played with it and also read https://css-tricks.com/complete-guide-table-element/.
I practised it first on other website, and it works, but not in Firefox…
You can view it here:
http://klepbankonline.nl/winkelwagen/, but put something in the shoppingcart first to see the table. I give a border radius to top and bottom corner td elements, but in firefox it’s not working.