Change default body display setting (#8941)

packages/next/pages/_document.tsx

@@ -356,7 +356,7 @@ export class Head extends Component<
               <noscript data-next-hydrating>
                 <style
                   dangerouslySetInnerHTML={{
-                    __html: `body{display:unset}`,
+                    __html: `body{display:block}`,
                   }}
                 />
               </noscript>