woocommerce/plugins/woocommerce-blocks/assets/js/blocks/cart-checkout/checkout/style.scss

.wc-block-checkout__add-note,
.wc-block-checkout__keep-updated,
.wc-block-checkout__use-address-for-billing {
	margin-top: $gap;
}

@include breakpoint( ">480px" ) {
	.wc-block-checkout__billing-fields,
	.wc-block-checkout__shipping-fields {
		.wc-block-address-form {
			margin-left: #{-$gap-small / 2};
			margin-right: #{-$gap-small / 2};

			&::after {
				content: "";
				clear: both;
				display: block;
			}

			.wc-block-text-input,
			.wc-block-select {
				float: left;
				margin-left: #{$gap-small / 2};
				margin-right: #{$gap-small / 2};
				position: relative;
				width: calc(50% - #{$gap-small});
			}

			.wc-block-address-form__company,
			.wc-block-address-form__address_1,
			.wc-block-address-form__address_2 {
				width: calc(100% - #{$gap-small});
			}

			.wc-block-checkbox {
				clear: both;
			}
		}
	}
}