how to change color of Elevated Button flutter code example

Example 1: how to change the color of the back button in app bar flutter

appBar: AppBar(
  iconTheme: IconThemeData(
    color: Colors.black, //change your color here
  ),
  title: Text("Sample"),
  centerTitle: true,
),

Example 2: how to change appbar color in flutter

appBar: AppBar(
      title: const Text('Example'),
      backgroundColor: Colors.black,
    ),