.woocommerce-billing-fields,
.woocommerce-shipping-fields,
.woocommerce-additional-fields,
.woocommerce-checkout #payment,
.woocommerce form.checkout .form-row,
form.woocommerce-checkout,
.wc_payment_methods,
#order_review,
#order_review_heading {
    display: none !important;
}

#wco-frontend-root * {
    box-sizing: border-box;
}

@media (max-width: 640px) {
    #wco-frontend-root .wco-checkout-wrap {
        grid-template-columns: 1fr !important;
        margin: 0 !important;
        border-radius: 0 !important;
        border: none !important;
    }

    #wco-frontend-root .wco-checkout-wrap > div:nth-child(3) {
        border-right: none !important;
        border-bottom: 1px solid #ebebeb;
    }
}