.woocommerce div.products div.product span.custom_product_label, .woocommerce div.products div.product span.onsale, span.custom_product_label, span.onsale {
background-color: red!important;
}
.woocommerce div.products div.product span.custom_product_label span.custom_product_label {
background-color: red!important!
}