feat: update navbar to cover top of the page

- Update the navbar to be sticky when scrolling the page and cover the top of the page.
- Fix the margins for every viewport.

apps/gacha/src/app/layout.tsx

@@ -4,7 +4,7 @@ import { Navbar } from '@imphnen-frontend-service/ui/organisms';
 
 export const AppLayout: FC = (): ReactElement => {
   return (
-    <main className="bg-primary-50 min-h-screen px-8 py-[60px]">
+    <main className="bg-primary-50 min-h-screen">
       <Navbar />
       <Outlet />
     </main>