Flutter Container宽度高度设置无效

问题：子Container 宽高始终为100

解决：为子Container 指定在父布局中的对齐方式

Container(

        width:100,

        height:100,

        color: Colors.red,

        child:Align(

                alignment: Alignment.topLeft,

                child:Container(

                        width:30,

                        height:30,

                        color: Colors.blue,

                        ),

              ),

);