how to align row in flutter code example

Example 1: flutter center row

mainAxisAlignment: MainAxisAlignment.center //Center Column contents vertically,

Example 2: flutter float right

Center(
  child: Container(
    height: 120.0,
    width: 120.0,
    color: Colors.blue[50],
    child: Align(
      alignment: Alignment.topRight,
      child: FlutterLogo(
        size: 60,
      ),
    ),
  ),
)