Hi,
I am sorry but like that, we can't ; the CSS is fully related to your website and to your template.
HikaShop display correctly the product images so if you have an issue, it is local to your website.
As you can see in our demo website, the thumbnails are displayed under the main image :
demo.hikashop.com/index.php/en/hikashop/...with-multiple-images
Please read the documentation "customize the display" in order to know more about the HikaShop customization (and know which file you have to edit):
www.hikashop.com/support/documentation/1...ize-the-display.html
And if you still have some issues ; please provide us some information to help us to see your issue too.
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.