Hi,
You have to use the browser CSS inspector to see the CSS rules applyed on the element.
You can also modify the CSS directly in your browser and see the result.
These elements are (partially) explain in the documentation.
The links are more precise for that.
You might also find good tutorials over the Internet for the 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.