Answers for "change color button back flutter"

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,
),

How to change background color of Elevated Button in flutter

ElevatedButton(
              style: ElevatedButton.styleFrom(
                primary: Colors.amber,
              ), 
              child: Text('ElevatedButton'),
              onPressed: () {},
            ),