Hello,
If you have some view overrides for the cart buttons or you're using the "legacy" add to cart ; it would explain why the classname you have configured are not used by HikaShop.
Otherwise please note that you can use some CSS to perform such kind of customization.
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.