Hi,
You can use a CSS inspector like explain in our FAQ
www.hikashop.com/en/support/documentation/faq.html#css
It would help you about CSS styling.
For example, thanks to the Firefox inspector (Ctrl+Maj+I), I am able to see which CSS file set which rule on a element.
So, I saw that there is a rule in the file skin5.css which override the color of the "add to cart" button
#bt_popup .bt_login_form #bt_login_title, div.productdetails-view div.product-price div.pricesalesprice, .moduletable h3 span.first-word, a:link, a:active, a:visited, #bt_error_message #bt_error_notice_text {
color: rgb(255, 153, 0);
}
So, you have to use the "!important" keyword in order to set a higher priority level for the "color" rule for "a.hikashop_cart_button".
Regards,