diff --git a/lib/custom_painters/language_icon.dart b/lib/custom_painters/language_icon.dart
index dbc2d1d87..e7b6aea6a 100644
--- a/lib/custom_painters/language_icon.dart
+++ b/lib/custom_painters/language_icon.dart
@@ -319,7 +319,7 @@ class LanguageIcon extends CustomPainter {
     path_0.close();
 
     final Paint paint0fill = Paint()..style = PaintingStyle.fill;
-    paint0fill.color = const Color(0xff737373).withOpacity(1.0);
+    paint0fill.color = const Color(0xff737373).withAlpha((1.0*255).toInt());
     canvas.drawPath(path_0, paint0fill);
   }
 
diff --git a/lib/custom_painters/talawa_logo.dart b/lib/custom_painters/talawa_logo.dart
index f10f32b7e..4cd054739 100644
--- a/lib/custom_painters/talawa_logo.dart
+++ b/lib/custom_painters/talawa_logo.dart
@@ -166,7 +166,7 @@ class AppLogo extends CustomPainter {
     path_0.close();
 
     final Paint paint0fill = Paint()..style = PaintingStyle.fill;
-    paint0fill.color = const Color(0xff31BB6B).withOpacity(1.0);
+    paint0fill.color = const Color(0xff31BB6B).withAlpha((1.0 * 255).toInt());
     canvas.drawPath(path_0, paint0fill);
 
     final Path path_1 = Path();
@@ -270,7 +270,7 @@ class AppLogo extends CustomPainter {
     path_1.close();
 
     final Paint paint1fill = Paint()..style = PaintingStyle.fill;
-    paint1fill.color = const Color(0xffFEBC59).withOpacity(1.0);
+    paint1fill.color = const Color(0xffFEBC59).withAlpha((1.0 * 255).toInt());
     canvas.drawPath(path_1, paint1fill);
 
     final Path path_2 = Path();
@@ -342,7 +342,7 @@ class AppLogo extends CustomPainter {
     path_2.close();
 
     final Paint paint2fill = Paint()..style = PaintingStyle.fill;
-    paint2fill.color = const Color(0xff737373).withOpacity(1.0);
+    paint2fill.color = const Color(0xff737373).withAlpha((1.0 * 255).toInt());
     canvas.drawPath(path_2, paint2fill);
 
     final Path path_3 = Path();
@@ -422,7 +422,7 @@ class AppLogo extends CustomPainter {
     path_3.close();
 
     final Paint paint3fill = Paint()..style = PaintingStyle.fill;
-    paint3fill.color = const Color(0xff737373).withOpacity(1.0);
+    paint3fill.color = const Color(0xff737373).withAlpha((1.0 * 255).toInt());
     canvas.drawPath(path_3, paint3fill);
   }
 
diff --git a/lib/custom_painters/telegram_logo.dart b/lib/custom_painters/telegram_logo.dart
index 7519d7bb4..a1242a3a3 100644
--- a/lib/custom_painters/telegram_logo.dart
+++ b/lib/custom_painters/telegram_logo.dart
@@ -17,8 +17,8 @@ class TelegramLogo extends CustomPainter {
     paint0Fill.shader = ui.Gradient.linear(
         Offset(size.width * 0.6670000, size.height * 0.1670000),
         Offset(size.width * 0.4170000, size.height * 0.7500000), [
-      const Color(0xff37aee2).withOpacity(1),
-      const Color(0xff1e96c8).withOpacity(1),
+      const Color(0xff37aee2).withAlpha((1.0 * 255).toInt()),
+      const Color(0xff1e96c8).withAlpha((1.0 * 255).toInt()),
     ], [
       0,
       1,
@@ -43,7 +43,7 @@ class TelegramLogo extends CustomPainter {
     path_1.lineTo(size.width * 0.7083333, size.height * 0.3333333);
 
     final Paint paint1Fill = Paint()..style = PaintingStyle.fill;
-    paint1Fill.color = const Color(0xffc8daea).withOpacity(1.0);
+    paint1Fill.color = const Color(0xffc8daea).withAlpha((1.0 * 255).toInt());
     canvas.drawPath(path_1, paint1Fill);
 
     final Path path_2 = Path();
@@ -60,7 +60,7 @@ class TelegramLogo extends CustomPainter {
     path_2.lineTo(size.width * 0.4168417, size.height * 0.6016958);
 
     final Paint paint2Fill = Paint()..style = PaintingStyle.fill;
-    paint2Fill.color = const Color(0xffa9c9dd).withOpacity(1.0);
+    paint2Fill.color = const Color(0xffa9c9dd).withAlpha((1.0 * 255).toInt());
     canvas.drawPath(path_2, paint2Fill);
 
     final Path path_3 = Path();
@@ -107,8 +107,8 @@ class TelegramLogo extends CustomPainter {
     paint3Fill.shader = ui.Gradient.linear(
         Offset(size.width * 0.6600000, size.height * 0.4370000),
         Offset(size.width * 0.8510000, size.height * 0.8020000), [
-      const Color(0xffeff7fc).withOpacity(1),
-      const Color(0xffffffff).withOpacity(1),
+      const Color(0xffeff7fc).withAlpha((1.0 * 255).toInt()),
+      const Color(0xffffffff).withAlpha((1.0 * 255).toInt()),
     ], [
       0,
       1,
diff --git a/lib/custom_painters/whatsapp_logo.dart b/lib/custom_painters/whatsapp_logo.dart
index fb150dd35..302176b37 100644
--- a/lib/custom_painters/whatsapp_logo.dart
+++ b/lib/custom_painters/whatsapp_logo.dart
@@ -103,7 +103,7 @@ class WhatsappLogo extends CustomPainter {
     );
 
     final Paint paint0Fill = Paint()..style = PaintingStyle.fill;
-    paint0Fill.color = const Color(0xff40c351).withOpacity(1.0);
+    paint0Fill.color = const Color(0xff40c351).withAlpha((1.0 * 255).toInt());
     canvas.drawPath(path_0, paint0Fill);
 
     final Path path_1 = Path();
@@ -422,7 +422,7 @@ class WhatsappLogo extends CustomPainter {
     path_1.close();
 
     final Paint paint1fill = Paint()..style = PaintingStyle.fill;
-    paint1fill.color = const Color(0xfffcfcfc).withOpacity(1.0);
+    paint1fill.color = const Color(0xfffcfcfc).withAlpha((1.0 * 255).toInt());
     canvas.drawPath(path_1, paint1fill);
   }
 
diff --git a/lib/services/navigation_service.dart b/lib/services/navigation_service.dart
index c82e033ff..78863f485 100644
--- a/lib/services/navigation_service.dart
+++ b/lib/services/navigation_service.dart
@@ -204,7 +204,7 @@ class NavigationService {
             Icons.error_outline,
             color: Colors.redAccent,
           ),
-          color: Colors.black.withOpacity(0.8),
+          color: Colors.black.withAlpha((1.0 * 255).toInt()),
         );
       },
     ).show(navigatorKey.currentContext!);
diff --git a/lib/view_model/access_request_view_model.dart b/lib/view_model/access_request_view_model.dart
index e630a709a..0773c77a2 100644
--- a/lib/view_model/access_request_view_model.dart
+++ b/lib/view_model/access_request_view_model.dart
@@ -44,7 +44,7 @@ class AccessScreenViewModel extends BaseModel {
     );
     if (result.data != null) {
       final OrgInfo membershipRequest = OrgInfo.fromJson(
-        ((result.data!)['sendMembershipRequest']
+        (result.data!['sendMembershipRequest']
             as Map<String, dynamic>)['organization'] as Map<String, dynamic>,
       );
       userConfig.updateUserMemberRequestOrg([membershipRequest]);
diff --git a/lib/view_model/main_screen_view_model.dart b/lib/view_model/main_screen_view_model.dart
index 44830316f..8d68f1d3b 100644
--- a/lib/view_model/main_screen_view_model.dart
+++ b/lib/view_model/main_screen_view_model.dart
@@ -178,7 +178,7 @@ class MainScreenViewModel extends BaseModel {
     currentPageIndex = mainScreenIndex;
     showAppTour = fromSignUp || demoMode;
     context = ctx;
-
+    final appTourDialogWidget = appTourDialog(ctx);
     print(ctx);
     print(context);
     pluginPrototypeData = {
@@ -196,7 +196,7 @@ class MainScreenViewModel extends BaseModel {
       Future.delayed(
         const Duration(seconds: 1),
         () => navigationService.pushDialog(
-          appTourDialog(ctx),
+          appTourDialogWidget,
         ),
       );
     }
diff --git a/lib/views/after_auth_screens/chat/widgets/chat_input_field.dart b/lib/views/after_auth_screens/chat/widgets/chat_input_field.dart
index c9606800d..0fa2cab6e 100644
--- a/lib/views/after_auth_screens/chat/widgets/chat_input_field.dart
+++ b/lib/views/after_auth_screens/chat/widgets/chat_input_field.dart
@@ -51,7 +51,7 @@ class _ChatInputFieldState extends State<ChatInputField> {
           BoxShadow(
             offset: const Offset(0, 4),
             blurRadius: 32,
-            color: const Color(0xFF087949).withOpacity(0.08),
+            color: const Color(0xFF087949).withAlpha((0.08 * 255).toInt()),
           ),
         ],
       ),
@@ -94,7 +94,7 @@ class _ChatInputFieldState extends State<ChatInputField> {
                                 .textTheme
                                 .bodyLarge!
                                 .color!
-                                .withOpacity(0.64),
+                                .withAlpha((0.64 * 255).toInt()),
                           ),
                         ),
                         // Placeholder text for the text field
diff --git a/lib/views/after_auth_screens/events/edit_agenda_item_page.dart b/lib/views/after_auth_screens/events/edit_agenda_item_page.dart
index f620c3c63..0fd7e63bd 100644
--- a/lib/views/after_auth_screens/events/edit_agenda_item_page.dart
+++ b/lib/views/after_auth_screens/events/edit_agenda_item_page.dart
@@ -79,7 +79,7 @@ class _EditAgendaItemPageState extends State<EditAgendaItemPage> {
                             Icons.error_outline,
                             color: Colors.redAccent,
                           ),
-                          color: Colors.black.withOpacity(0.8),
+                          color: Colors.black.withAlpha((0.8 * 255).toInt()),
                         );
                       },
                     ).show(context);
diff --git a/lib/views/after_auth_screens/events/manage_agenda_items_screen.dart b/lib/views/after_auth_screens/events/manage_agenda_items_screen.dart
index 0c27135b0..8ef7acc3e 100644
--- a/lib/views/after_auth_screens/events/manage_agenda_items_screen.dart
+++ b/lib/views/after_auth_screens/events/manage_agenda_items_screen.dart
@@ -77,7 +77,7 @@ class ManageAgendaScreen extends StatelessWidget {
                                       Icons.error_outline,
                                       color: Colors.redAccent,
                                     ),
-                                    color: Colors.black.withOpacity(0.8),
+                                    color: Colors.black.withAlpha((0.8 * 255).toInt()),
                                   );
                                 },
                               ).show(context);
diff --git a/lib/views/after_auth_screens/feed/individual_post.dart b/lib/views/after_auth_screens/feed/individual_post.dart
index 8718fe18c..885262424 100644
--- a/lib/views/after_auth_screens/feed/individual_post.dart
+++ b/lib/views/after_auth_screens/feed/individual_post.dart
@@ -242,7 +242,7 @@ class CommentTemplate extends StatelessWidget {
         Expanded(
           child: Container(
             decoration: BoxDecoration(
-              color: Theme.of(context).iconTheme.color!.withOpacity(0.2),
+              color: Theme.of(context).iconTheme.color!.withAlpha((0.2 * 255).toInt()),
               borderRadius: const BorderRadius.all(Radius.circular(8)),
             ),
             padding: const EdgeInsets.all(16.0),
diff --git a/lib/views/after_auth_screens/org_info_screen.dart b/lib/views/after_auth_screens/org_info_screen.dart
index bb34827fd..b5207b77b 100644
--- a/lib/views/after_auth_screens/org_info_screen.dart
+++ b/lib/views/after_auth_screens/org_info_screen.dart
@@ -99,7 +99,7 @@ class OrganisationInfoScreen extends StatelessWidget {
                       height: imageHeight,
                       width: double.infinity,
                       decoration: BoxDecoration(
-                        color: Colors.black.withOpacity(0.55),
+                        color: Colors.black.withAlpha((0.55 * 255).toInt()),
                         borderRadius: const BorderRadius.only(
                           bottomLeft: Radius.circular(20.0),
                           bottomRight: Radius.circular(20.0),
@@ -341,7 +341,7 @@ class OrganisationInfoScreen extends StatelessWidget {
                     borderRadius: BorderRadius.circular(20),
                     boxShadow: [
                       BoxShadow(
-                        color: Colors.grey.withOpacity(0.5),
+                        color: Colors.grey.withAlpha((0.5 * 255).toInt()),
                         spreadRadius: 1,
                         blurRadius:
                             Theme.of(context).brightness == Brightness.dark
diff --git a/lib/views/after_auth_screens/profile/edit_profile_page.dart b/lib/views/after_auth_screens/profile/edit_profile_page.dart
index 8dcd77fdf..27f0424ea 100644
--- a/lib/views/after_auth_screens/profile/edit_profile_page.dart
+++ b/lib/views/after_auth_screens/profile/edit_profile_page.dart
@@ -57,7 +57,7 @@ class _EditProfilePageState extends State<EditProfilePage> {
                                 : null,
                         backgroundColor:
                             model.imageFile == null && model.user.image == null
-                                ? Colors.grey.withOpacity(0.2)
+                                ? Colors.grey.withAlpha((0.2 * 255).toInt())
                                 : null,
                         child: model.imageFile == null
                             ? model.user.image == null
diff --git a/lib/views/pre_auth_screens/select_language.dart b/lib/views/pre_auth_screens/select_language.dart
index ef71ca2b1..9275d7404 100644
--- a/lib/views/pre_auth_screens/select_language.dart
+++ b/lib/views/pre_auth_screens/select_language.dart
@@ -90,7 +90,7 @@ class _SelectLanguageState extends State<SelectLanguage> {
                           decoration: BoxDecoration(
                             color: languages[index].langCode ==
                                     appLang.appLocal.languageCode
-                                ? const Color(0xFFC4C4C4).withOpacity(0.15)
+                                ? const Color(0xFFC4C4C4).withAlpha((0.15 * 255).toInt())
                                 : Colors.transparent,
                           ),
                           child: index == 0
diff --git a/lib/views/pre_auth_screens/set_url.dart b/lib/views/pre_auth_screens/set_url.dart
index ebc451f37..3314cde33 100644
--- a/lib/views/pre_auth_screens/set_url.dart
+++ b/lib/views/pre_auth_screens/set_url.dart
@@ -216,7 +216,7 @@ class _SetUrlState extends State<SetUrl> {
                                       color: Theme.of(context)
                                           .colorScheme
                                           .surface
-                                          .withOpacity(0.8),
+                                          .withAlpha((0.8 * 255).toInt()),
                                     ),
                               ),
                             ],
diff --git a/lib/widgets/agenda_item_tile.dart b/lib/widgets/agenda_item_tile.dart
index 991d6ac3c..a4235c9a8 100644
--- a/lib/widgets/agenda_item_tile.dart
+++ b/lib/widgets/agenda_item_tile.dart
@@ -181,7 +181,7 @@ class ExpandableAgendaItemTile extends StatelessWidget {
         return GestureDetector(
           onTap: () => Navigator.of(context).pop(),
           child: ColoredBox(
-            color: Colors.black.withOpacity(0.5),
+            color: Colors.black.withAlpha((0.5 * 255).toInt()),
             child: Center(
               child: InteractiveViewer(
                 panEnabled: true,
diff --git a/lib/widgets/create_recurring_event_helper_widgets.dart b/lib/widgets/create_recurring_event_helper_widgets.dart
index df3d0240e..b2f4fdaa7 100644
--- a/lib/widgets/create_recurring_event_helper_widgets.dart
+++ b/lib/widgets/create_recurring_event_helper_widgets.dart
@@ -235,7 +235,7 @@ class _EventEndOptionsState extends State<EventEndOptions> {
                           : TextStyle(
                               color: Theme.of(context)
                                   .dividerColor
-                                  .withOpacity(0.4),
+                                  .withAlpha((0.4 * 255).toInt()),
                             ),
                     ),
                   ),
diff --git a/lib/widgets/custom_avatar.dart b/lib/widgets/custom_avatar.dart
index 7d8ce4343..8250b971f 100644
--- a/lib/widgets/custom_avatar.dart
+++ b/lib/widgets/custom_avatar.dart
@@ -42,7 +42,7 @@ class CustomAvatar extends StatelessWidget {
         //creating the avatar with the icon-theme color when the image is null
         ? CircleAvatar(
             backgroundColor:
-                Theme.of(context).iconTheme.color!.withOpacity(0.2),
+                Theme.of(context).iconTheme.color!.withAlpha((0.2 * 255).toInt()),
             maxRadius: maxRadius,
             child: Center(
               child: Text(
@@ -60,7 +60,7 @@ class CustomAvatar extends StatelessWidget {
             imageBuilder: (context, imageProvider) {
               return CircleAvatar(
                 backgroundColor:
-                    Theme.of(context).iconTheme.color!.withOpacity(0.2),
+                    Theme.of(context).iconTheme.color!.withAlpha((0.2 * 255).toInt()),
                 backgroundImage: imageProvider,
               );
             },
diff --git a/lib/widgets/custom_list_tile.dart b/lib/widgets/custom_list_tile.dart
index 9b0e9114a..9c9e45061 100644
--- a/lib/widgets/custom_list_tile.dart
+++ b/lib/widgets/custom_list_tile.dart
@@ -87,7 +87,7 @@ class CustomListTile extends StatelessWidget {
             borderRadius: BorderRadius.circular(20),
             boxShadow: [
               BoxShadow(
-                color: Colors.grey.withOpacity(0.5),
+                color: Colors.grey.withAlpha((0.5 * 255).toInt()),
                 spreadRadius: 1,
                 blurRadius: 6,
                 offset: const Offset(0, 3),
diff --git a/lib/widgets/custom_weekday_selector.dart b/lib/widgets/custom_weekday_selector.dart
index f46ef92d1..f81d66815 100644
--- a/lib/widgets/custom_weekday_selector.dart
+++ b/lib/widgets/custom_weekday_selector.dart
@@ -38,7 +38,7 @@ class _CustomWeekDaySelectorState extends State<CustomWeekDaySelector> {
               height: 30,
               decoration: BoxDecoration(
                 color: weekdays.contains(weekday)
-                    ? Theme.of(context).colorScheme.primary.withOpacity(0.5)
+                    ? Theme.of(context).colorScheme.primary.withAlpha((0.5 * 255).toInt())
                     : Colors.transparent,
                 border: Border.all(
                   width: weekdays.contains(weekday) ? 2 : 1,
diff --git a/lib/widgets/event_card.dart b/lib/widgets/event_card.dart
index 52480d78b..5e796478e 100644
--- a/lib/widgets/event_card.dart
+++ b/lib/widgets/event_card.dart
@@ -56,7 +56,7 @@ class EventCard extends StatelessWidget {
                     height: SizeConfig.screenHeight! * 0.11,
                     width: double.infinity,
                     decoration: BoxDecoration(
-                      color: Colors.grey.withOpacity(0.3),
+                      color: Colors.grey.withAlpha((0.3 * 255).toInt()),
                       image: const DecorationImage(
                         fit: BoxFit.fitWidth,
                         alignment: FractionalOffset.topCenter,
@@ -68,7 +68,7 @@ class EventCard extends StatelessWidget {
                         filter: ImageFilter.blur(sigmaX: 5, sigmaY: 5),
                         child: Container(
                           decoration: BoxDecoration(
-                            color: Colors.white.withOpacity(0.0),
+                            color: Colors.white.withAlpha((0.0 * 255).toInt()),
                           ),
                         ),
                       ),
diff --git a/lib/widgets/pinned_carousel_widget.dart b/lib/widgets/pinned_carousel_widget.dart
index b4f5bcf58..77d41ee7e 100644
--- a/lib/widgets/pinned_carousel_widget.dart
+++ b/lib/widgets/pinned_carousel_widget.dart
@@ -30,7 +30,7 @@ class PinnedPostCarousel extends StatelessWidget {
         Container(
           height: 220,
           color:
-              Theme.of(context).colorScheme.primaryContainer.withOpacity(0.5),
+              Theme.of(context).colorScheme.primaryContainer.withAlpha((0.5 * 255).toInt()),
           child: CustomCarouselScroller(
             pinnedPosts: pinnedPosts,
             key: const Key('Carousel'),
diff --git a/lib/widgets/venue_card.dart b/lib/widgets/venue_card.dart
index 7d2a1e685..55c28be57 100644
--- a/lib/widgets/venue_card.dart
+++ b/lib/widgets/venue_card.dart
@@ -36,7 +36,7 @@ class VenueCard extends StatelessWidget {
             ),
             elevation: 3,
             color: isSelected
-                ? Colors.blue.withOpacity(0.3)
+                ? Colors.blue.withAlpha((0.3 * 255).toInt())
                 : Theme.of(context).primaryColor,
             child: Column(
               children: [
@@ -47,7 +47,7 @@ class VenueCard extends StatelessWidget {
                     height: SizeConfig.screenHeight! * 0.11,
                     width: double.infinity,
                     decoration: BoxDecoration(
-                      color: Colors.grey.withOpacity(0.3),
+                      color: Colors.grey.withAlpha((0.3 * 255).toInt()),
                       image: DecorationImage(
                         fit: BoxFit.fitWidth,
                         alignment: FractionalOffset.topCenter,
diff --git a/talawa_lint/lib/talawa_api_doc/talawa_api_doc_fixer.dart b/talawa_lint/lib/talawa_api_doc/talawa_api_doc_fixer.dart
index 09f18c32e..191bf95d0 100644
--- a/talawa_lint/lib/talawa_api_doc/talawa_api_doc_fixer.dart
+++ b/talawa_lint/lib/talawa_api_doc/talawa_api_doc_fixer.dart
@@ -82,7 +82,9 @@ class TalawaAPIDocFixer extends DartFix {
             node.offset,
             node.leftBracket.offset - node.offset,
           ),
-        )) return;
+        )) {
+      return;
+    }
 
     // The same issue exists for Functions and Methods. We can define functions
     // inside functions, and the same overlap of [SourceRange] occurs due to that
@@ -95,7 +97,9 @@ class TalawaAPIDocFixer extends DartFix {
                     node.name.length + node.name.offset) -
                 node.offset,
           ),
-        )) return;
+        )) {
+      return;
+    }
 
     if (node is MethodDeclaration &&
         !analysisError.sourceRange.intersects(
@@ -104,7 +108,9 @@ class TalawaAPIDocFixer extends DartFix {
             (node.parameters?.offset ?? node.name.length + node.name.offset) -
                 node.offset,
           ),
-        )) return;
+        )) {
+      return;
+    }
 
     final changeBuilder = reporter.createChangeBuilder(
       message: 'Insert Doc skeleton',
diff --git a/test/views/after_auth_screens/events/manage_agenda_items_screen_test.dart b/test/views/after_auth_screens/events/manage_agenda_items_screen_test.dart
index 93ab85ce1..7007a04bb 100644
--- a/test/views/after_auth_screens/events/manage_agenda_items_screen_test.dart
+++ b/test/views/after_auth_screens/events/manage_agenda_items_screen_test.dart
@@ -305,7 +305,7 @@ void main() {
       // Verify toast styling
       final ToastCard toastCard =
           tester.widget<ToastCard>(find.byType(ToastCard));
-      expect(toastCard.color, Colors.black.withOpacity(0.8));
+      expect(toastCard.color, Colors.black.withAlpha((0.8 * 255).toInt()));
 
       // Wait for auto-dismiss
       await tester.pump(const Duration(seconds: 2));
diff --git a/test/widget_tests/pre_auth_screens/select_language_page_test.dart b/test/widget_tests/pre_auth_screens/select_language_page_test.dart
index 9b762034f..21569c715 100644
--- a/test/widget_tests/pre_auth_screens/select_language_page_test.dart
+++ b/test/widget_tests/pre_auth_screens/select_language_page_test.dart
@@ -151,7 +151,7 @@ Future<void> main() async {
 
         expect(
           (tester.firstWidget(findAppNameWidget) as Container).decoration,
-          BoxDecoration(color: const Color(0xFFC4C4C4).withOpacity(0.15)),
+          BoxDecoration(color: const Color(0xFFC4C4C4).withAlpha((0.15 * 255).toInt())),
         );
       });
       testWidgets("Testing to navigate to MainScreen", (tester) async {
@@ -255,7 +255,7 @@ Future<void> main() async {
 
         expect(
           (tester.firstWidget(findAppNameWidget) as Container).decoration,
-          BoxDecoration(color: const Color(0xFFC4C4C4).withOpacity(0.15)),
+          BoxDecoration(color: const Color(0xFFC4C4C4).withAlpha((0.15 * 255).toInt())),
         );
       });
       testWidgets("Testing to select and navigate button appears",
diff --git a/test/widget_tests/widgets/agenda_item_tile_test.dart b/test/widget_tests/widgets/agenda_item_tile_test.dart
index e0aed941b..5e06cb6a2 100644
--- a/test/widget_tests/widgets/agenda_item_tile_test.dart
+++ b/test/widget_tests/widgets/agenda_item_tile_test.dart
@@ -347,7 +347,7 @@ void main() {
           find.byWidgetPredicate(
             (widget) =>
                 widget is ColoredBox &&
-                widget.color == Colors.black.withOpacity(0.5),
+                widget.color == Colors.black.withAlpha((0.5 * 255).toInt()),
           ),
           findsOneWidget,
         );
diff --git a/test/widget_tests/widgets/custom_avatar_test.dart b/test/widget_tests/widgets/custom_avatar_test.dart
index 79419bf51..a4d2db2d7 100644
--- a/test/widget_tests/widgets/custom_avatar_test.dart
+++ b/test/widget_tests/widgets/custom_avatar_test.dart
@@ -134,7 +134,7 @@ void main() {
       Theme.of(tester.element(circleAvatarFinder))
           .iconTheme
           .color!
-          .withOpacity(0.2),
+          .withAlpha((0.2 * 255).toInt()),
     );
   });
 
@@ -322,7 +322,7 @@ void main() {
                 Theme.of(widgetTester.binding.rootElement!)
                     .iconTheme
                     .color!
-                    .withOpacity(0.2),
+                    .withAlpha((0.2 * 255).toInt()),
       ),
       findsOneWidget,
     );