woocommerce/plugins/woocommerce-blocks/assets/js/base/components/input-row/style.scss

.wc-block-input-row {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;

	> .wc-block-select,
	> .wc-block-text-input {
		margin-right: $gap-small;
		flex-basis: 0;
		flex-grow: 1;
		margin-top: $gap;
		&:last-child {
			margin-right: 0;
		}
	}

	// Responsive media styles.
	@include breakpoint( "<480px" ) {
		.wc-block-text-input {
			margin-right: 0;
		}
	}
}