set tab color

lib/index_page.dart

@@ -32,10 +32,10 @@ class _IndexPageState extends State<IndexPage>
     
     // Initialize tabs with screen adaptation
     _tabs = [
-      Tab(child: Text('Alarm', style: TextStyle(fontSize: 16.sp))),
-      Tab(child: Text('Clock', style: TextStyle(fontSize: 16.sp))),
-      Tab(child: Text('Stopwatch', style: TextStyle(fontSize: 16.sp))),
-      Tab(child: Text('Timer', style: TextStyle(fontSize: 16.sp))),
+      Tab(child: Text('Alarm', style: TextStyle(fontSize: 16.sp, color: Colors.black))),
+      Tab(child: Text('Clock', style: TextStyle(fontSize: 16.sp, color: Colors.black))),
+      Tab(child: Text('Stopwatch', style: TextStyle(fontSize: 16.sp, color: Colors.black))),
+      Tab(child: Text('Timer', style: TextStyle(fontSize: 16.sp, color: Colors.black))),  
     ];
     
   }