src/pages/\_app.tsx

import type { AppProps } from "next/app";
import "../styles/globals.css";

const App = ({ Component, pageProps }: AppProps) => {
 return (
    <div>
      <nav>
        <a href="/">Home</a>
        <a href="/about">About</a>
      </nav>
      <div>
        <Component {...pageProps} />
      </div>
    </div>
 );
};

export default App;