Hello,
Edit these files via child theme –
wp-content/themes/legenda/woocommerce/cart/cart-empty.php
…/legenda/woocommerce/loop/no-products-found.php
Try to use the next custom CSS code:
.woocommerce-message, .alert-success, .success {
background-color: #151515 !important;
color: #98c391;
}
Regards