Hi,
Which "image" are you talking about exactly ?
If you're talking about the "image" in the popup ; it is logical that there is no CSS applied to it because the content of the popup is not into an iframe ; we are then returning to the original issue of that post ; and I have to give you the exact same answer than my previous one.
At the moment when you will insert a working popup to display the product page like it should be display, the result will be correct.
Otherwise, the content you currently have is not the content in the HikaShop context ; so it cannot work properly.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.