.custom-error{
    color:#e2401c;
    font-size:13px;
    margin-top:5px;
    display:block;
}

.woocommerce-invalid input,
.woocommerce-invalid select{
    border-color:#e2401c !important;
}

.woocommerce-validated input,
.woocommerce-validated select{
    border-color:#16a34a !important;
}
button.single_add_to_cart_button.button.alt {
    background-color: #61CE70 !important;
}