FlatButton 대체 TextButton

child: TextButton(
  onPressed: () {},
  style: TextButton.styleFrom(
      primary: Colors.white,
      backgroundColor: Colors.red
  ),
  child: Row(
    mainAxisAlignment:
        MainAxisAlignment.center,
    children: [
      Icon(Icons.play_arrow),
      Text('재생')
    ],
  ),
),