React routing tutorial - 2

App.js

import React from "react";

function App() {
  return (
    <div style={{ display: "flex", height: "100vh", alignItems: "stretch" }}>
      <div style={{ flex: 0.3, backgroundColor: "#f2f2f2" }}>route menu</div>
      <div>content</div>
    </div>
  );
}

export default App;