How to change the appBar back button color

I cannot figure out how to change the appBar’s automatic back button to a different color. it’s under a scaffold and I’ve tried to research it but I can’t wrap my head around it.

return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.white,
        title: Image.asset(
          'images/.jpg',
          fit: BoxFit.fill,
        ),
        centerTitle: true,
      ),