Hello,
1) We have added an option to change the color of the icon https://prnt.sc/1u8e5o5
2) Use the below custom code
.et_product-block .single-wishlist .wishlist-fragment i, .et_product-block .single-wishlist .wishlist-fragment i + span {
background: #222222;
padding: 10px;
color: #fff;
border-radius: 5px;
}
.et_product-block .single-wishlist .wishlist-fragment i {
border-radius: 5px 0 0 5px;
padding: 10px 0 10px 10px;
}
.et_product-block .single-wishlist .wishlist-fragment i + span {
border-radius: 0 5px 5px 0;
}
Regards