Shape in RaisedButton in Flutter?

If you want to get something fancier, it is highly recommended to use the Image for the background of RaisedButton shape , and then you can use an ExImage for the icon. I'm  new to Flutter so I train myself by making a simple form. I realized while I was debugging on my iPhone the virtual keyboard triggered an error : "A RenderFlex overflowed by 29 pixels on the bottom". I fixed this issue by wrapping my Container inside a SingleChildScrollView. The problem now is my Column's content is no longer center. I can't figure out why ... Here's my code to help you to understand : List<Widget> _buildBody() { var listWidget = List<Widget>(); SingleChildScrollView singleChild = SingleChildScrollView( padding: EdgeInsets.only(top: 1.0), child: Container( alignment: Alignment.center, margin: EdgeInsets.all(30.0), padding: EdgeInsets.all(10.0), child: Form( key: _formKey, ...