flutter-11-05.dart

            Center(
              child: Stack(
                children: <Widget>[
                  Align(
                    alignment: Alignment.center,
                    child: Container(
                      margin: const EdgeInsets.all(7.0),
                      padding: const EdgeInsets.all(30.0),
                      decoration: BoxDecoration(
                          border: Border.all(
                              color: const Color(0xffFFAC38), width: 3),
                          borderRadius:
                              BorderRadius.all(Radius.circular(10.0))),
                      child: SelectableText(
                        "4671-0884-7276-4345-8709",
                        style: TextStyle(
                          color: Colors.black,
                          fontSize: 18,
                          fontWeight: FontWeight.bold,
                        ),
                        textAlign: TextAlign.justify,
                      ),
                    ),
                  ),
                  Align(
                      alignment: Alignment.topCenter,
                      child: DecoratedBox(
                        decoration: BoxDecoration(color: Colors.white),
                        child: Text(' Token '),
                      )),
                ],
              ),
            ),