class fancybox-iframe not showing webpage

Hi Tobias, the browser error console reports:

Refused to display ‘https://santegra.com/catalog/products/perfem-fortetm-30.html’ in a frame because it set ‘X-Frame-Options’ to ‘sameorigin’.

This means that the site/server santegra.com sends the response header X-Frame-Options: SAMEORIGIN asking to NOT be embedded in an iframe on other domains. The browser complies and blocks the request, resulting in a blank iframe light box window.

This can only be prevented by either adding an X-Frame-Options "ALLOW-FROM https://www.santegra-international.com/" response header to santegra.com (see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options) or copy the needed pages to the domain santegra-international.com

Hope these tips help!