.woocommerce-billing-fields__field-wrapper .form-row {
    width: 100% !important;
    float: none !important;
    margin: 0 !important;
}

.woocommerce-billing-fields__field-wrapper .form-row-wide {
    grid-column: 1 / -1;
}

.woocommerce-billing-fields__field-wrapper .form-row-first,
.woocommerce-billing-fields__field-wrapper .form-row-last {
    width: auto !important;
}