在扑朔迷离中面临的问题

enter image description here

我当前的代码:

Container(
                  height: 1 / 3 * deviceSize.height,
                  width: double.infinity,
                  child: Text(
                    'Add New Location',
                    style: TextStyle(color: Colors.black, fontSize: 20.0),
                  ),
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.only(
                        bottomLeft: Radius.elliptical(300, 100),
                        bottomRight: Radius.elliptical(300, 100)),
                    color: Color(0xFFFAD02E),
                  ),
                )

我没有得到想要的结果....:/