Hello,
Thank you for creating a topic on our support forum.
We have prepared for you a code snippet that will apply black background for elements you need. Just place it in Theme Settings -> Custom CSS
.basel-navigation .menu>li.menu-item-design-full-width>.sub-menu-dropdown,
.basel-navigation .menu>li.menu-item-design-sized>.sub-menu-dropdown,
.basel-navigation .menu>li.menu-item-design-default .sub-menu-dropdown{
background-color: black;
}
.basel-products-nav .product-short {
background-color: black;
border-color: rgb(24, 24, 24);
}
.shop_table td.product-name a {
color:white;
}
Regards