#billing_postcode-error,
#shipping_postcode-error{
    color: #e2401c;
    font-size: small;
}

.woocommerce-checkout #billing_postcode_field.blockUI.blockOverlay:before,
.woocommerce-checkout #shipping_postcode_field.blockUI.blockOverlay:before {
    width: 20px;
    height: 40px;
    top: initial;
    margin-top: 26px;
    margin-left: 0;
}

@media screen and (max-width: 992px) {

    .woocommerce-checkout #billing_postcode_field.blockUI.blockOverlay:before,
    .woocommerce-checkout #shipping_postcode_field.blockUI.blockOverlay:before {
        left: 100%;
        margin-left: -50px;
    }
}