Flutter-crypto-wallet-06.dart

            Container(
              alignment: Alignment.topCenter,
              padding: new EdgeInsets.only(
                  top: MediaQuery.of(context).size.height * .25,
                  right: 10.0,
                  left: 10.0),
              child: new Container(
                height: MediaQuery.of(context).size.height,
                width: MediaQuery.of(context).size.width,
              ),
            )