woocommerce/plugins/woocommerce-blocks/assets/js/blocks/order-confirmation/summary/style.scss

.editor-styles-wrapper .wc-block-order-confirmation-summary,
.wc-block-order-confirmation-summary {
	margin-top: $gap-largest;
	margin-bottom: $gap-largest;
	border-radius: $universal-border-radius;
}
.wc-block-order-confirmation-summary {
	ul {
		list-style: none outside;
		display: flex;
		flex-direction: row;
		margin: 0;
		padding: 0;
		gap: $gap;
		flex-wrap: wrap;
		justify-content: space-between;

		li {
			> .wc-block-order-confirmation-summary-list-item__key {
				font-weight: bold;
			}
			> .wc-block-order-confirmation-summary-list-item__value {
				font-weight: inherit;
				display: block;
			}
		}

		@media only screen and (max-width: 480px) {
			li {
				width: 100%;

				> .wc-block-order-confirmation-summary-list-item__key,
				> .wc-block-order-confirmation-summary-list-item__value {
					display: inline;
				}
			}
		}
	}

	&.has-background {
		padding: $gap;
	}
}