purchase-button: refactor color
purchase-button: refactor color

kellybinary/binary-static,kellybinary/binary-static,ashkanx/binary-static,binary-com/binary-static,binary-static-deployed/binary-static,4p00rv/binary-static,4p00rv/binary-static,binary-static-deployed/binary-static,ashkanx/binary-static,kellybinary/binary-static,binary-com/binary-static,ashkanx/binary-static,binary-static-deployed/binary-static,binary-com/binary-static,4p00rv/binary-static