woocommerce/plugins/woocommerce-blocks/assets/js/blocks/cart-checkout-shared/sidebar-notices/editor.scss

.wc-default-page-notice.is-dismissible {
	margin: 0;
	padding-right: 16px;
	.components-notice__dismiss {
		min-width: 24px;
	}
	svg {
		width: 16px;
		height: 16px;
	}
}