woo-checkout.css

@media (min-width: 769px) {
    .oxy-woo-checkout .woocommerce .col2-set,
    .oxy-woo-checkout .woocommerce-page .col2-set {
        display: block;
    }
    .woocommerce.woocommerce-checkout form #customer_details.col2-set,
    .woocommerce-page.woocommerce-checkout form #customer_details.col2-set {
        width: 55%;
        float: left;
        margin-right: 4.347826087%;
    }
    .woocommerce.woocommerce-checkout form #customer_details.col2-set .col-1,
    .woocommerce.woocommerce-checkout form #customer_details.col2-set .col-2,
    .woocommerce-page.woocommerce-checkout form #customer_details.col2-set .col-1,
    .woocommerce-page.woocommerce-checkout form #customer_details.col2-set .col-2 {
        float: none;
        width: auto;
    }
    .woocommerce.woocommerce-checkout form #order_review,
    .woocommerce.woocommerce-checkout form #order_review_heading,
    .woocommerce-page.woocommerce-checkout form #order_review,
    .woocommerce-page.woocommerce-checkout form #order_review_heading {
        width: 40%;
        float: right;
        margin-right: 0;
        clear: right;
    }
}