在react应用程序中，跨度堆叠在彼此的顶部，而不是彼此的下方

import React from 'react';
import './styles.css';

const App = () => {
  return (
    <div className="container">
      <div className="box red">Box 1</div>
      <div className="box blue">Box 2</div>
      <div className="box green">Box 3</div>
    </div>
  );
};

export default App;

.container {
  position: relative;
}

.box {
  position: absolute;
  width: 200px;
  height: 200px;
}

.red {
  background-color: red;
  top: 0;
  left: 0;
}

.blue {
  background-color: blue;
  top: 50px;
  left: 50px;
}

.green {
  background-color: green;
  top: 100px;
  left: 100px;
}