When product details in modal add to cart button not display

[panosrekou]

Hi,
I am trying to use a modal pop up quick look to display the details of a product. When I choose color and size the add to cart button does not display.
From a search to forum i found that the fancybox may causes an conflict, but I did not manage to fix the problem.

This is the site
http://hariscotton.gr/en/woman/woman-summer/woman-summer-dresses

I could use any help!

Thank U