SliverAppBar(
      backgroundColor: Colors.white,
      expandedHeight: 250,
      floating: false,
      pinned: true,
      iconTheme: const IconThemeData(color: Colors.blueAccent), //<----
      flexibleSpace: FlexibleSpaceBar(
        centerTitle: true,
        title: Container(
          alignment: Alignment.bottomCenter,
          width: double.infinity,
          height: double.infinity,
          child: const PhotoAvatarBecary(),
        ),
      ),
    );