How can i place cancel icon on top right corner

Here is my code

 InkWell(
                        onTap: () {
                          Navigator.pop(context);
                        },
                        child: Align(
                          alignment: Alignment(1,-1),
                          child: CircleAvatar(
                            maxRadius: 20,
                            backgroundColor: Colors.transparent,
                            child: Image.asset('assets/cancel.png',height: 30,),
                          ),
                        ),
                      ),

I got this

I want like this

If you are using AlertDialog then you can use icon and iconPadding to keep the close image top right.

  Future<void> _showMyDialog() async {
    return showDialog<void>(
      context: context,
      barrierDismissible: false,
      builder: (BuildContext context) {
        return AlertDialog(
          iconPadding: const EdgeInsets.all(0),
          icon: Align(
            alignment: Alignment.topRight,
            child: InkWell(
              onTap: () {
                Navigator.pop(context);
              },
              child: Icon(Icons.close),
              // child: Image.asset(
              //   'assets/cancel.png',
              //   height: 30,
              // ),
            ),
          ),
          content: const SingleChildScrollView(
            child: ListBody(
              children: <Widget>[
                Text('This is a demo alert dialog.'),
                Text('Would you like to approve of this message?'),
              ],
            ),
          ),
          actions: <Widget>[
            TextButton(
              child: const Text('Approve'),
              onPressed: () {
                Navigator.of(context).pop();
              },
            ),
          ],
        );
      },
    );
  }

I have removed CircleAvatar because it is used for user Profile Image. This Widget will give extra padding and I was not able to remove the padding. Please check if this solution works.