diff --git a/packages/block-editor/src/components/iframe/content.scss b/packages/block-editor/src/components/iframe/content.scss
index d33ed7818aa2a..1d01f84b5fd1f 100644
--- a/packages/block-editor/src/components/iframe/content.scss
+++ b/packages/block-editor/src/components/iframe/content.scss
@@ -23,10 +23,10 @@
 	$frame-size: var(--wp-block-editor-iframe-zoom-out-frame-size);
 	$inner-height: var(--wp-block-editor-iframe-zoom-out-inner-height);
 	$content-height: var(--wp-block-editor-iframe-zoom-out-content-height);
-	$outer-container-width: var(--wp-block-editor-iframe-zoom-out-outer-container-width);
+	$scale-container-width: var(--wp-block-editor-iframe-zoom-out-scale-container-width);
 	$container-width: var(--wp-block-editor-iframe-zoom-out-container-width, 100vw);
 	// Apply an X translation to center the scaled content within the available space.
-	transform: translateX(calc((#{$outer-container-width} - #{$container-width}) / 2 / #{$scale}));
+	transform: translateX(calc((#{$scale-container-width} - #{$container-width}) / 2 / #{$scale}));
 	scale: #{$scale};
 	background-color: $gray-300;
 
diff --git a/packages/block-editor/src/components/iframe/index.js b/packages/block-editor/src/components/iframe/index.js
index b72d86ef8e0f8..b14514f934fb3 100644
--- a/packages/block-editor/src/components/iframe/index.js
+++ b/packages/block-editor/src/components/iframe/index.js
@@ -122,7 +122,7 @@ function Iframe( {
 	}, [] );
 	const { styles = '', scripts = '' } = resolvedAssets;
 	const [ iframeDocument, setIframeDocument ] = useState();
-	const initialContainerWidth = useRef();
+	const initialContainerWidth = useRef( 0 );
 	const [ bodyClasses, setBodyClasses ] = useState( [] );
 	const clearerRef = useBlockSelectionClearer();
 	const [ before, writingFlowRef, after ] = useWritingFlow();
@@ -247,6 +247,11 @@ function Iframe( {
 		}
 	}, [ containerWidth, isZoomedOut ] );
 
+	const scaleContainerWidth = Math.max(
+		initialContainerWidth.current,
+		containerWidth
+	);
+
 	const disabledRef = useDisabled( { isDisabled: ! readonly } );
 	const bodyRef = useMergeRefs( [
 		useBubbleEvents( iframeDocument ),
@@ -299,17 +304,6 @@ function Iframe( {
 	useEffect( () => cleanup, [ cleanup ] );
 
 	const zoomOutAnimationClassnameRef = useRef( null );
-	const handleZoomOutAnimationClassname = () => {
-		clearTimeout( zoomOutAnimationClassnameRef.current );
-
-		iframeDocument.documentElement.classList.add( 'zoom-out-animation' );
-
-		zoomOutAnimationClassnameRef.current = setTimeout( () => {
-			iframeDocument.documentElement.classList.remove(
-				'zoom-out-animation'
-			);
-		}, 400 ); // 400ms should match the animation speed used in components/iframe/content.scss
-	};
 
 	// Toggle zoom out CSS Classes only when zoom out mode changes. We could add these into the useEffect
 	// that controls settings the CSS variables, but then we would need to do more work to ensure we're
@@ -320,6 +314,20 @@ function Iframe( {
 			return;
 		}
 
+		const handleZoomOutAnimationClassname = () => {
+			clearTimeout( zoomOutAnimationClassnameRef.current );
+
+			iframeDocument.documentElement.classList.add(
+				'zoom-out-animation'
+			);
+
+			zoomOutAnimationClassnameRef.current = setTimeout( () => {
+				iframeDocument.documentElement.classList.remove(
+					'zoom-out-animation'
+				);
+			}, 400 ); // 400ms should match the animation speed used in components/iframe/content.scss
+		};
+
 		handleZoomOutAnimationClassname();
 		iframeDocument.documentElement.classList.add( 'is-zoomed-out' );
 
@@ -349,10 +357,7 @@ function Iframe( {
 			scale === 'default'
 				? ( Math.min( containerWidth, maxWidth ) -
 						parseInt( frameSize ) * 2 ) /
-						Math.max(
-							initialContainerWidth.current,
-							containerWidth
-						)
+						scaleContainerWidth
 				: scale
 		);
 
@@ -374,15 +379,10 @@ function Iframe( {
 			`${ containerWidth }px`
 		);
 		iframeDocument.documentElement.style.setProperty(
-			'--wp-block-editor-iframe-zoom-out-outer-container-width',
-			`${ Math.max( initialContainerWidth.current, containerWidth ) }px`
+			'--wp-block-editor-iframe-zoom-out-scale-container-width',
+			`${ scaleContainerWidth }px`
 		);
 
-		// iframeDocument.documentElement.style.setProperty(
-		// 	'--wp-block-editor-iframe-zoom-out-outer-container-width',
-		// 	`${ Math.max( initialContainerWidth.current, containerWidth ) }px`
-		// );
-
 		return () => {
 			iframeDocument.documentElement.style.removeProperty(
 				'--wp-block-editor-iframe-zoom-out-scale'
@@ -400,7 +400,7 @@ function Iframe( {
 				'--wp-block-editor-iframe-zoom-out-container-width'
 			);
 			iframeDocument.documentElement.style.removeProperty(
-				'--wp-block-editor-iframe-zoom-out-outer-container-width'
+				'--wp-block-editor-iframe-zoom-out-scale-container-width'
 			);
 		};
 	}, [
@@ -412,6 +412,7 @@ function Iframe( {
 		containerWidth,
 		windowInnerWidth,
 		isZoomedOut,
+		scaleContainerWidth,
 	] );
 
 	// Make sure to not render the before and after focusable div elements in view
@@ -501,12 +502,8 @@ function Iframe( {
 					isZoomedOut && 'is-zoomed-out'
 				) }
 				style={ {
-					'--wp-block-editor-iframe-zoom-out-outer-container-width':
-						isZoomedOut &&
-						`${ Math.max(
-							initialContainerWidth.current,
-							containerWidth
-						) }px`,
+					'--wp-block-editor-iframe-zoom-out-scale-container-width':
+						isZoomedOut && `${ scaleContainerWidth }px`,
 				} }
 			>
 				{ iframe }
diff --git a/packages/block-editor/src/components/iframe/style.scss b/packages/block-editor/src/components/iframe/style.scss
index d05be2f3977b9..5dd30c338057e 100644
--- a/packages/block-editor/src/components/iframe/style.scss
+++ b/packages/block-editor/src/components/iframe/style.scss
@@ -9,8 +9,8 @@
 }
 
 .block-editor-iframe__scale-container.is-zoomed-out {
-	$outer-container-width: var(--wp-block-editor-iframe-zoom-out-outer-container-width, 100vw);
-	width: $outer-container-width;
+	$scale-container-width: var(--wp-block-editor-iframe-zoom-out-scale-container-width, 100vw);
+	width: $scale-container-width;
 	// Position the iframe so that it is always aligned with the right side so that
 	// the scrollbar is always visible on the right side
 	position: absolute;