Step 1:

Install a controller.

	 final controller = OverlapTransitionController();

Step 2:

import the dependency.

import 'package:overlap_transition/overlap_transition.dart';

Step 3:

Add widgets OverlapTransition

 return OverlapTransition(
      duration: Duration(seconds: 1),
      curves: Curves.decelerate,
  
      overlapTransitionController: controller,
      primary: Scaffold(
        body: Center(
          child: ElevatedButton(
            onPressed: () => controller.forward(),
            child: Text("Next"),
          ),
        ),
      ),
      secundary: Scaffold(
        body: Center(
          child: ElevatedButton(
            onPressed: () => controller.reverse(),
            child: Text("Back"),
          ),
        ),
      ),
    );

• primary Fist wdiget

• secundary Widget overlap