<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Simple React Calculator</title>
</head>
<body>
<div id="root"></div>
<script src="index.js"></script>
</body>
</html>
import React from 'react';
import ReactDOM from 'react-dom';
import Calculator from './App';
ReactDOM.render(<Calculator />, document.getElementById('root'));