some changes

lib/core/routes/app_shell/desktop_shell_page.dart

@@ -28,6 +28,7 @@ class DesktopShellPage extends StatelessWidget {
     return Container(
       height: 64,
       decoration: BoxDecoration(
+        color: AppColors.backgroundColor,
         border: Border(bottom: BorderSide(color: AppColors.grey30)),
       ),
 

lib/core/routes/app_shell/tablet_shell_page.dart

@@ -29,6 +29,7 @@ class TabletShellPage extends StatelessWidget {
             height: 64.0.h(),
             padding: EdgeInsets.symmetric(horizontal: 24.0.w()),
             decoration: BoxDecoration(
+              color: AppColors.backgroundColor,
               border: Border(
                 bottom: BorderSide(color: AppColors.grey30, width: 1),
               ),