:::
6-2 取得螢幕大小+圓角矩形
6-2-1 Container 陰影
Container(
decoration: BoxDecoration(
color: Color(0xffffffff),
boxShadow: [
BoxShadow(
color: Color(0x49000000),
blurRadius : 3.0,
offset: Offset(0, 3.0),
),
],
),
),
