.woocommerce-billing-fields #select2-billing_country-container {
    font-size: 14px;
    font-weight: 400;
    line-height: 20px;
    padding: 5px 20px 5px 5px;
}

.woocommerce-billing-fields .select2-selection.select2-selection--single {
    height: 31px;
}