Images are shown to small in product detail view

-- HikaShop version -- : actual
-- Joomla version -- : 3.4.8
-- PHP version -- : 5.5.9.1
-- Browser(s) name and version -- : Chrome

HI,
i hope i scanned all ressources but i could not figure out why my product images on the detail product page are shown just too small even thy are 500x500px when i upload them?
I digged around in the css of the image but could not figure out the problem.
Thanks in advance for your help!
regards
carsten

Ok i found the option i missed. So no need to reply!