CODE EXAMPLE FOR PYTHON

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@override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      body: Center(
        child: Padding(
          padding: const EdgeInsets.all(40.0),
          child: ClipShadowPath(
            clipper: _MyClipper(100),
            shadow: const Shadow(
              blurRadius: 15,
              color: Colors.grey,
              offset: Offset(0, 10),
            ),
            child: SizedBox(
              height: 400,
              child: Container(
                color: Colors.white,
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: const [
                    Spacer(),
                  ],
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}

class _MyClipper extends CustomClipper<Path> {
  final double space;

  _MyClipper(this.space);

  @override
  Path getClip(Size size) {
    final path = Path();
    final halfWidth = size.width / 2;
    final halfSpace = space / 2;
    final curve = space / 6;
    final height = halfSpace / 1.4;
    path.lineTo(halfWidth - halfSpace, 0);
    path.cubicTo(halfWidth - halfSpace, 0, halfWidth - halfSpace + curve,
        height, halfWidth, height);

    path.cubicTo(halfWidth, height, halfWidth + halfSpace - curve, height,
        halfWidth + halfSpace, 0);

    path.lineTo(size.width, 0);
    path.lineTo(size.width, size.height);
    path.lineTo(0, size.height);
    path.close();

    return path;
  }

  @override
  bool shouldReclip(covariant CustomClipper<Path> oldClipper) => true;
}