React Js Add Month to Date

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8" />
  <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.development.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.development.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
  <div id="app"></div>
  <script type="text/babel">
    const { useState } = React;

const App = () => {
     const [startDate, setStartDate] = useState(new Date());
      const [monthsToAdd, setMonthsToAdd] = useState(1);

const handleAddMonths = () => {
        const newDate = new Date(startDate);
        newDate.setMonth(newDate.getMonth() + monthsToAdd);
        setStartDate(newDate);
      };

return (
        <div className='container'>
          <h3>React Js Add Month to Date</h3>
          <p>Start Date: {startDate.toDateString()}</p>
          <p>Months to Add: {monthsToAdd}</p>
          <input
            type="number"
            value={monthsToAdd}
            onChange={(e) => setMonthsToAdd(parseInt(e.target.value))}
          />
          <button onClick={handleAddMonths}>Add Months</button>
        </div>
      );
    };

ReactDOM.render(<App />, document.getElementById("app"));
  </script>
  <style>
    .container {
      text-align: center;
      box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12),
        0 2px 4px 0 rgba(0, 0, 0, 0.24);
      width: 600px;
      margin: 0 auto;
      padding: 20px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }

h3 {
      font-size: 24px;
      margin-bottom: 15px;
    }

input {
      width: 100%;
      padding: 10px;
      margin: 5px 0;
      border: 1px solid #ccc;
      border-radius: 4px;
      font-size: 16px;
    }

button {
      padding: 10px 20px;
      background-color: #007bff;
      color: #fff;
      border: none;
      border-radius: 4px;
      cursor: pointer;
      font-size: 16px;
      transition: background-color 0.3s ease;
    }

button:hover {
      background-color: #0056b3;
    }

br {
      margin: 10px 0;
    }

.address {
      margin-top: 1.2em;
      margin-bottom: 1.2em;
      text-align: initial;
      font-size: 17px;
      font-weight: 400;
      color: #3c3a3a;
   
    }
  </style>
</body>

</html>