diff --git a/packages/block-editor/src/components/iframe/content.scss b/packages/block-editor/src/components/iframe/content.scss
index 90b887993bf6d..dc5cbb91a80fe 100644
--- a/packages/block-editor/src/components/iframe/content.scss
+++ b/packages/block-editor/src/components/iframe/content.scss
@@ -25,6 +25,10 @@
 	border: 0 solid $gray-300;
 	transform-origin: top center;
 	@include editor-canvas-resize-animation;
+
+	// Applying flex here prevents the body element, and title inside, from margin-collapse.
+	display: flex;
+	flex-direction: column;
 }
 
 .block-editor-iframe__html.is-zoomed-out {