function App() {
  return (
    <div className="flex flex-col items-center justify-center min-h-screen bg-gray-100">
      <h1 className="text-4xl font-bold text-gray-800">Hello, world!</h1>
      <p className="mt-4 text-lg text-gray-600">This is a simple React app.</p>
    </div>
  );
}

export default App;