color property Null safety

Color? color

Color of the series.

If no color is specified, then the series will be rendered with the default palette color.

Defaults to null

Widget build(BuildContext context) {
   return Container(
       child: SfCartesianChart(
           series: <BubbleSeries<BubbleColors, num>>[
                  BubbleSeries<BubbleColors, num>(
                      color: const Color.fromRGBO(255, 0, 102, 1),


final Color? color;