How to change background color and elevation of Alertdialog

AlertDialog(
            title: Text('Welcome'),
            content: Text('Do you wanna learn flutter?'),
            actions: [
              TextButton(
                onPressed: () {
                  Navigator.of(context).pop();
                },
                child: Text('YES', style: TextStyle(color: Colors.black),),
              ),
              TextButton(
                onPressed: () {
                  Navigator.of(context).pop();
                },
                child: Text('NO', style: TextStyle(color: Colors.black),),
              ),
            ],
            elevation: 10,
            backgroundColor: Colors.green,
          ),