Flutter/UI/Container

サンプル

new Container(
  padding: const EdgeInsets.all(10.0),
  margin: const EdgeInsets.all(5.0),
  decoration: new BoxDecoration(
    border: new Border.all(width: 4.0, color: Colors.blue),
    borderRadius: const BorderRadius.all(const Radius.circular(5.0)),
  ),
  child: new Text("こんてなです"),
);