Use a portal to render the Drawer close button to fix the alignment with the Mini-Cart Contents block (https://github.com/woocommerce/woocommerce-blocks/pull/9507)

plugins/woocommerce-blocks/assets/js/base/components/drawer/close-button.tsx

@@ -0,0 +1,7 @@
+const DrawerCloseButton = () => {
+	// The Drawer component will use a portal to render the close button inside
+	// this div.
+	return <div className="wc-block-components-drawer__close-wrapper"></div>;
+};
+
+export default DrawerCloseButton;

plugins/woocommerce-blocks/assets/js/base/components/drawer/index.tsx

@@ -7,7 +7,7 @@
  */
 import classNames from 'classnames';
 import { useDebounce } from 'use-debounce';
-import type { ForwardedRef, KeyboardEvent } from 'react';
+import type { ForwardedRef, KeyboardEvent, RefObject } from 'react';
 import { __ } from '@wordpress/i18n';
 import {
 	createPortal,
@@ -41,6 +41,33 @@ interface DrawerProps {
 	slideOut?: boolean;
 }
 
+interface CloseButtonPortalProps {
+	onClick: () => void;
+	contentRef: RefObject< HTMLDivElement >;
+}
+
+const CloseButtonPortal = ( {
+	onClick,
+	contentRef,
+}: CloseButtonPortalProps ) => {
+	const closeButtonWrapper = contentRef?.current?.querySelector(
+		'.wc-block-components-drawer__close-wrapper'
+	);
+
+	return closeButtonWrapper
+		? createPortal(
+				<Button
+					className="wc-block-components-drawer__close"
+					icon={ close }
+					onClick={ onClick }
+					label={ __( 'Close', 'woo-gutenberg-products-block' ) }
+					showTooltip={ false }
+				/>,
+				closeButtonWrapper
+		  )
+		: null;
+};
+
 const UnforwardedDrawer = (
 	{
 		children,
@@ -137,12 +164,9 @@ const UnforwardedDrawer = (
 					role="document"
 					ref={ contentRef }
 				>
-					<Button
-						className="wc-block-components-drawer__close"
+					<CloseButtonPortal
+						contentRef={ contentRef }
 						onClick={ onRequestClose }
-						icon={ close }
-						label={ __( 'Close', 'woo-gutenberg-products-block' ) }
-						showTooltip={ false }
 					/>
 					{ children }
 				</div>
@@ -152,6 +176,7 @@ const UnforwardedDrawer = (
 	);
 };
 
-export const Drawer = forwardRef( UnforwardedDrawer );
+const Drawer = forwardRef( UnforwardedDrawer );
 
 export default Drawer;
+export { default as DrawerCloseButton } from './close-button';

plugins/woocommerce-blocks/assets/js/blocks/mini-cart/mini-cart-contents/block.tsx

@@ -1,6 +1,7 @@
 /**
  * External dependencies
  */
+import { DrawerCloseButton } from '@woocommerce/base-components/drawer';
 
 /**
  * Internal dependencies
@@ -17,5 +18,10 @@ export const MiniCartContentsBlock = (
 ): JSX.Element => {
 	const { children } = props;
 
-	return <>{ children }</>;
+	return (
+		<>
+			<DrawerCloseButton />
+			{ children }
+		</>
+	);
 };

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

@@ -57,6 +57,7 @@
 	.wp-block-woocommerce-mini-cart-contents {
 		box-sizing: border-box;
 		padding: 0;
+		position: relative;
 		justify-content: center;
 
 		.wc-block-components-notices {

plugins/woocommerce-blocks/assets/js/blocks/mini-cart/test/block.js

@@ -25,7 +25,14 @@ import { defaultCartState } from '../../../data/cart/default-state';
 const MiniCartBlock = ( props ) => (
 	<SlotFillProvider>
 		<Block
-			contents='<div class="wc-block-mini-cart-contents"></div>'
+			contents='<div data-block-name="woocommerce/mini-cart-contents" class="wp-block-woocommerce-mini-cart-contents"><div data-block-name="woocommerce/filled-mini-cart-contents-block" class="wp-block-woocommerce-filled-mini-cart-contents-block"><div data-block-name="woocommerce/mini-cart-title-block" class="wp-block-woocommerce-mini-cart-title-block"><div data-block-name="woocommerce/mini-cart-title-label-block" class="wp-block-woocommerce-mini-cart-title-label-block"></div>
+			<div data-block-name="woocommerce/mini-cart-title-items-counter-block" class="wp-block-woocommerce-mini-cart-title-items-counter-block"></div></div>
+			<div data-block-name="woocommerce/mini-cart-items-block" class="wp-block-woocommerce-mini-cart-items-block"><div data-block-name="woocommerce/mini-cart-products-table-block" class="wp-block-woocommerce-mini-cart-products-table-block"></div></div>
+			<div data-block-name="woocommerce/mini-cart-footer-block" class="wp-block-woocommerce-mini-cart-footer-block"><div data-block-name="woocommerce/mini-cart-cart-button-block" class="wp-block-woocommerce-mini-cart-cart-button-block"></div>
+			<div data-block-name="woocommerce/mini-cart-checkout-button-block" class="wp-block-woocommerce-mini-cart-checkout-button-block"></div></div></div>
+			<div data-block-name="woocommerce/empty-mini-cart-contents-block" class="wp-block-woocommerce-empty-mini-cart-contents-block">
+			<p class="has-text-align-center"><strong>Your cart is currently empty!</strong></p>
+			<div data-block-name="woocommerce/mini-cart-shopping-button-block" class="wp-block-woocommerce-mini-cart-shopping-button-block"></div></div></div>'
 			{ ...props }
 		/>
 	</SlotFillProvider>
@@ -88,7 +95,32 @@ describe( 'Testing Mini-Cart', () => {
 		await waitFor( () => expect( fetchMock ).toHaveBeenCalled() );
 		userEvent.click( screen.getByLabelText( /items/i ) );
 
-		expect( fetchMock ).toHaveBeenCalledTimes( 1 );
+		await waitFor( () =>
+			expect( screen.getByText( /your cart/i ) ).toBeInTheDocument()
+		);
+	} );
+
+	it( 'closes the drawer when clicking on the close button', async () => {
+		render( <MiniCartBlock /> );
+		await waitFor( () => expect( fetchMock ).toHaveBeenCalled() );
+
+		// Open drawer.
+		userEvent.click( screen.getByLabelText( /items/i ) );
+
+		// Close drawer.
+		let closeButton = null;
+		await waitFor( () => {
+			closeButton = screen.getByLabelText( /close/i );
+		} );
+		if ( closeButton ) {
+			userEvent.click( closeButton );
+		}
+
+		await waitFor( () => {
+			expect(
+				screen.queryByText( /your cart/i )
+			).not.toBeInTheDocument();
+		} );
 	} );
 
 	it( 'renders empty cart if there are no items in the cart', async () => {