text: import React, { Component } from 'react';
  import loading from './loading.svg';
  
  class Callback extends Component {
    render() {
      console.log('callback...');
      const style = {
        position: 'absolute',
        display: 'flex',
        justifyContent: 'center',
        height: '100vh',
        width: '100vw',
        top: 0,
        bottom: 0,
        left: 0,
        right: 0,
        backgroundColor: 'white',
      }
  
      return (
        <div style={style}>
          <img src={loading} alt="loading"/>
        </div>
      );
    }
  }
  
  export default Callback;
  