.btn_fav{
    transition: 500ms;
}

.btn_fav.added, .product_grid .product .tools > .btn_fav.added {
    background-color: var(--color-selecting);
}

.btn_fav .added_icon, .btn_fav.added .normal_icon{
    display: none;
}

.btn_fav.added .added_icon{
    display: inline-block;
}

.product_page .actions .btn_fav.added{
   color: var(--color-selecting);
    background-color: unset;
}