work on styles

components/Layout.tsx

@@ -4,9 +4,9 @@ import Header from './Header'
 
 export default function Layout({ children }: { children: React.ReactNode }) {
   return (
-    <div id="app">
+    <div>
       <Header />
-      <div id="content">{children}</div>
+      <main>{children}</main>
     </div>
   )
 }