/* hide country/region on customer registration page */
.form-create-account .field.country,
.form-create-account .field.region {
    display: none !important;
}

/* hide country/region on checkout page */
.form-shipping-address .field[name="shippingAddress.country_id"],
.billing-address-form .field[name$=".country_id"] {
    display: none !important;
}