Hi,
Sorry, the code was for Joomla version of the ShopAndBuy, for the WordPress version try with the following custom css code (the second part is for mouse over color)
#main-menu .sub-menu li a {
color: #b78e00;
}
#main-menu .sub-menu li a:hover,
#main-menu .sub-menu li a:active,
#main-menu .sub-menu li a:focus {
color: #aaa!important;
}
Cheers
Joshua