我有一个屏幕，上面有一个SafeArea小部件，然后里面的所有内容都用容器 Package 起来，作为一个主体传递给SafeArea，但是当我想改变容器的颜色时，它总是保持白色。
我实现这个用户界面的方式有问题吗？我怎样才能改变这个颜色？

class _MeetingScreenState extends State<MeetingScreen> {
  @override
  Widget build(BuildContext context) {
    return SafeArea(
      left: false,
      right: false,
      child: Container(
// Container color to change
        color: Colors.black87,
        child: Material(
          child: Padding(
            padding: const EdgeInsets.all(16),
            child: Column(
              children: [
                Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      ActionIconButton(
                          iconState: false,
                          iconStateOn: Icons.cameraswitch_outlined,
                          iconStateOff: Icons.cameraswitch_outlined),
                      Column(
                        children: const [
                          Text('Meeting title'),
                          // TODO implement meeting time
                          Text('04:28')
                        ],
                      ),
                      ActionIconButton(
                          iconState: _switchCamera,
                          iconStateOn: Icons.volume_up_outlined,
                          iconStateOff: Icons.volume_off_outlined,
                      iconBackgroundColor: AppColors.white,
                      activeIconColor: AppColors.white,
                      inactiveColor: AppColors.whiteWithOpacity,)
                    ],
                  ),
                )
              ],
            ),
          ),
        ),
      ),
    );
  }
}