Flutter的Container边框线和圆角

Container(
    decoration: new BoxDecoration(
        border: new Border.all(color: Color(0xFFFF0000), width: 0.5),
        color: Color(0xFF9E9E9E),
        borderRadius: new BorderRadius.circular((20.0))),
    height: 48.0,
    alignment: Alignment.center,
    child: Text('sdsd')
)

代码如下: