Fix scrolling on iPhone and mobile.

packages/edit-post/src/components/layout/style.scss

@@ -85,10 +85,14 @@
 		padding-bottom: 0;
 	}
 
-	// On mobile the main content area has to scroll otherwise you can invoke
-	// the overscroll bounce on the non-scrolling container, causing
-	// (ノಠ益ಠ)ノ彡┻━┻
-	overflow-y: auto;
+	// On mobile the main content (html or body) area has to scroll.
+	// If, like we do on the desktop, scroll an element (.edit-post-layout__content) you can invoke
+	// the overscroll bounce on the non-scrolling container, causing for a frustrating scrolling experience.
+	// The following rule enables this scrolling beyond the mobile breakpoint, because on the desktop
+	// breakpoints scrolling an isolated element helps avoid scroll bleed.
+	@include break-small() {
+		overflow-y: auto;
+	}
 	-webkit-overflow-scrolling: touch;
 
 	// This rule ensures that if you've scrolled to the end of a container,