update

lib/widgets/snackbar_widget.dart

@@ -0,0 +1,13 @@
+import 'package:flutter/material.dart';
+
+void showNotification(BuildContext context, String text, bool isPositive) {
+  ScaffoldMessenger.of(context).showSnackBar(
+    SnackBar(
+      content: Text(text),
+      backgroundColor: isPositive ? const Color.fromRGBO(37, 106, 32, 1) : const Color.fromRGBO(188, 59, 50, 1),
+      elevation: 4.0,
+      behavior: SnackBarBehavior.floating,
+      duration: const Duration(seconds: 3),
+    ),
+  );
+}