title: How to change the appBar back button color
body: <p>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. </p>
  
  <pre><code>return Scaffold(
        appBar: AppBar(
          backgroundColor: Colors.white,
          title: Image.asset(
            'images/.jpg',
            fit: BoxFit.fill,
          ),
          centerTitle: true,
        ),
  </code></pre>