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lib/navigation/transition/fade_page_transitions_builder.dart

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+import 'package:flutter/material.dart';
+
+class FadePageTransitionsBuilder extends PageTransitionsBuilder {
+
+  const FadePageTransitionsBuilder();
+
+  @override
+  Widget buildTransitions<T>(
+      PageRoute<T>? route,
+      BuildContext? context,
+      Animation<double> animation,
+      Animation<double> secondaryAnimation,
+      Widget child,
+      ) {
+    return _FadePagePageTransition(
+      animation: animation,
+      secondaryAnimation: secondaryAnimation,
+      child: child,
+    );
+  }
+}
+
+class _FadePagePageTransition extends StatelessWidget {
+
+  const _FadePagePageTransition({
+    required this.animation,
+    required this.secondaryAnimation,
+    required this.child,
+  });
+
+  final Animation<double> animation;
+  final Animation<double> secondaryAnimation;
+  final Widget child;
+
+  @override
+  Widget build(BuildContext context) {
+    var curveTween = CurveTween(curve: Curves.easeIn);
+    return FadeTransition(
+      opacity: animation.drive(curveTween),
+      child: child,
+    );
+  }
+}