Main image not responsive

-- url of the page with the problem -- : 77.104.145.188/~goldfeat/index.php/exoti...ed-wyandotte-bantams
-- HikaShop version -- : 3.0.1
-- Joomla version -- : 3.6.5
-- PHP version -- : 5.6
-- Browser(s) name and version -- : firefox

I can't figure out how or where I may have set a min height on the images, but it seems they are not behaving responsively .

please take a look and see if you can tell me where i need to change to have the main image scale down for mobile. I have looked through forums and all places and cannot find it!!

I do not have height or width set in my menu item, those fields are blank.

Thank you,
Cheryl