问如何让一个方形的应用程序栏按钮在颤动？

EN

  return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.green,
        title: Text(
          'Title',
        ),
        centerTitle: true,
        actions: [
          // squared button/icon
          Padding(
            padding: const EdgeInsets.only(right: 20.0, top: 10.0, bottom: 10.0),
            child: Container(
              width: 35,
              decoration: BoxDecoration(
                borderRadius: BorderRadius.circular(8.0),
                color: Colors.white.withOpacity(0.5),
              ),
              child: Center(
                child: Icon(
                  Icons.settings,
                  color: Colors.white,
                ),
              ),
            ),
          ),
        ],
      ),
  body: .... YOUR WIDGETS ...