I get it now. I have updated the Custom CSS on the site. This is the full CSS.
body[data-sppb-color-mode="Dark"] .easystore-drawer-header,
body[data-sppb-color-mode="Dark"] .easystore-h2,
body[data-sppb-color-mode="Dark"] .easystore-cart-item-title,
body[data-sppb-color-mode="Dark"] .easystore-product-quantity,
body[data-sppb-color-mode="Dark"] .easystore-cart-item-subtotal,
body[data-sppb-color-mode="Dark"] .easystore-price-with-tax{
color: #000000 !important;
}
body[data-sppb-color-mode="Dark"] .easystore-product-quantity{
border-bottom: 1px solid #000000;
}
body[data-sppb-color-mode="Dark"] .btn-outline-primary,
body[data-sppb-color-mode="Dark"] .easystore-cart-visit,
body[data-sppb-color-mode="Dark"] .easystore-cart-checkout{
border: transparent;
background: linear-gradient(180deg, #000000, #000000);
color: #ffffff;
}
body[data-sppb-color-mode="Dark"] .easystore-cart-visit:hover,
body[data-sppb-color-mode="Dark"] .easystore-cart-checkout:hover,
body[data-sppb-color-mode="Dark"] .easystore-cart-empty-state .btn-outline-primary:hover{
border: transparent;
background: linear-gradient(180deg, #6a6a6c, #000000);
}