Hello,
Without a link or precise details about the issue ; I'm afraid that we won't be able to give you any useful help.
If you want to customize HikaShop and its CSS ; if you do need to perform modifications to improve the compatibility between your template and HikaShop, we do have a documentation for that :
www.hikashop.com/support/documentation/1...the-display.html#css
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.