Extend Container behind bottom navigation flutter

Question

I am trying to extend the white container behind the bottom navigation bar to the very end of the screen. Not just to the limit of the botton navigation bar (as you can see in the picture).

Any help or idea is really appreciated, I am quite new in Flutter. Thanks!

The structure of the app is:

bottomNavigationBar: BottomAppBar(
    shape: CircularNotchedRectangle(),
    notchMargin: 8.0,
    child: Row(
      mainAxisSize: MainAxisSize.max,
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: <Widget>[
        IconButton(
          icon: Icon(
            Icons.show_chart,
          ),
          onPressed: () {},
        ),
        SizedBox(width: 48.0),
        IconButton(
          icon: Icon(
            Icons.filter_list,
          ),
          onPressed: () {},
        ),
      ],
    ),
  ),
  floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
  floatingActionButton: FloatingActionButton(
    child: Icon(Icons.add),
    onPressed: () {},
  ),
  body: Column(
    children: <Widget>[
      Expanded(
        child: Container(
        height: 100,
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.only(
            topLeft: Radius.circular(40),
            topRight: Radius.circular(40)
          )
        ),
      ),
      )
    ],
  )

Answer 1

you can use "extendBody: true" inside "Scaffold" class

Scaffold(
    extendBody: true,
    body: _yourBody(),
    bottomNavigationBar: _yourBottomNavBar(),
)