React Js Convert File Size to MB

<!DOCTYPE html>
<html>

return (
        <div className='container'>
          <h3>React Js Convert File Size to KB</h3>
          <input type="file" onChange={handleFileInputChange} />
          <div>
            <p className='file-size '>File Size in Bytes: {fileSizeInBytes} bytes</p>
            <p className='file-size '>File Size in KB: {fileSizeInKB.toFixed(2)} KB</p>
          </div>
        </div>
      );
    }

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

.container {
      margin: 0 auto;
      width: 500px;
      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);
      padding: 20px;
    }

/* Style the file size text */
    .file-size {
      margin-top: 10px;
      font-size: 14px;
      color: #555;
    }
  </style>
</body>

</html>