Fix overflow hidden style being omitted

packages/block-library/src/cover/style.scss

@@ -7,11 +7,11 @@
 	justify-content: center;
 	align-items: center;
 	padding: 1em;
+	overflow: hidden;
 	// This block has customizable padding, border-box makes that more predictable.
 	box-sizing: border-box;
 	// Keep the flex layout direction to the physical direction (LTR) in RTL languages.
 	/*rtl:raw: direction: ltr; */
-	overflow: hidden;
 
 	/**
 	 * Set a default background color for has-background-dim _unless_ it includes another