safaribook-aspnet-core5-and-react/QandA/frontend/src/App.tsx

/** @jsxImportSource @emotion/react */
import { css } from '@emotion/react';

import React from 'react';
import { Header } from './Header';
import { HomePage } from './HomePage';

function App() {
  return (
    <div
      css={css`
        font-family: 'Segoe UI', 'Helvetica Neue', sans-serif;
        font-size: 16px;
        color: #5c5a5a;
      `}
    >
      <Header />
      <HomePage />
    </div>
  );
}

class ProblemComponent extends React.Component {
  render() {
    return <div ref="div" />;
  }
}

export default App;