React Js Add Hours to a 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;
    function App() {
      const [initialDate, setInitialDate] = useState(new Date());
      const [hoursToAdd, setHoursToAdd] = useState(1);
      const handleAddHours = () => {
        const newDate = new Date(initialDate);
        newDate.setHours(newDate.getHours() + hoursToAdd);
        setInitialDate(newDate);
      };

return (
        <div className='container'>
          <h1 className='title'>React js Add Hours to a Date</h1>
          <div>
            <p className='date-paragraph'>Initial Date: {initialDate.toString()}</p>
            <p className='hours-paragraph'>Hours to Add: {hoursToAdd}</p>
            <input
              className='hours-input'
              type="number"
              value={hoursToAdd}
              onChange={(e) => setHoursToAdd(parseInt(e.target.value, 10))}
            />
            <button className='add-hours-button' onClick={handleAddHours}>Add Hours</button>
          </div>
        </div>

);
    }

ReactDOM.render(<App />, document.getElementById("app"));
  </script>

.title {
      font-size: 24px;
      text-align: center;
      color: #333;
      margin-bottom: 20px;
    }

.date-paragraph,
    .hours-paragraph {
      font-size: 18px;
      color: #555;
      margin-bottom: 10px;
    }

.hours-input {
      width: 100%;
      padding: 10px;
      margin-bottom: 20px;
      border: 1px solid #ccc;
      border-radius: 5px;
      font-size: 16px;
      box-sizing: border-box;
    }

.hours-input:focus {
      outline: none;
      border-color: #007bff;
    }

.add-hours-button {
      display: block;
      width: 100%;
      padding: 10px;
      background-color: #007bff;
      color: #fff;
      border: none;
      border-radius: 5px;
      font-size: 16px;
      cursor: pointer;
      transition: background-color 0.2s;
    }

.add-hours-button:hover {
      background-color: #0056b3;
    }
  </style>
</body>

</html>