React Js Convert hex string into int

<!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 [hexString, setHexString] = useState('ff00');
      const [decimalValue, setDecimalValue] = useState(0);

const handleInputChange = (event) => {
        const inputHex = event.target.value;
        const decimal = parseInt(inputHex, 16);
        setHexString(inputHex);
        setDecimalValue(decimal);
      };

return (
        <div className='container'>
          <h3>React Js Convert hex string into int</h3>
          <input
            type="text"
            placeholder="Enter Hexadecimal String"
            value={hexString}
            onInput={handleInputChange}
          />
          <p>Decimal Value: {decimalValue}</p>
        </div>
      );
    }

ReactDOM.render(<App />, document.getElementById('app'));
  </script>
  <style>
    .container {
      width: 600px;
      margin: 0 auto;
      box-shadow: rgba(0, 0, 0, 0.1) 0px 4px 6px -1px, rgba(0, 0, 0, 0.06) 0px 2px 4px -1px;
      padding: 20px;
    }

h3 {
      font-size: 24px;
      color: #333;
      margin-bottom: 20px;
    }

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

input::placeholder {
      color: #999;
    }

p {
      font-size: 18px;
      color: #555;
    }
  </style>
</body>

</html>