Flutter vertical outlined label

pretty_vertical_label.dart

import 'dart:math' as math;

Transform.rotate(
  angle: -math.pi / 2,
  child: Material(
    shape: ContinuousRectangleBorder(
      side: BorderSide(width: 2.0, color: Colors.red),
      borderRadius: BorderRadius.circular(4.0),
    ),
    child: Padding(
      padding: const EdgeInsets.symmetric(
        vertical: 2.0,
        horizontal: 3.0,
      ),
      child: Text(
        'ADMIN',
        style: TextStyle(color: Colors.red, fontSize: 12.0),
      ),
    ),
  ),
)