buildTransitions method
Implementation
Widget buildTransitions(
    BuildContext context,
    Curve curve,
    Alignment? alignment,
    Animation<double> animation,
    Animation<double> secondaryAnimation,
    Widget child) {
  return Align(
    alignment: Alignment.center,
    child: SizeTransition(
      sizeFactor: CurvedAnimation(
        parent: animation,
        curve: curve,
      ),
      child: child,
    ),
  );
}