color property
Customizes the color of the plot band. Since the plot band is rendered above the axis line, you can customize the color of the plot band for a transparent view of the axis line.
Defaults to Color.fromRGBO(191, 212, 252, 0.5).
@override
Widget build(BuildContext context) {
 return Scaffold(
   body: Center(
       child: SfSparkAreaChart(
     plotBand: SparkChartPlotBand(start: 15, end: 25, color: Colors.red),
     data: <double>[18, 24, 30, 14, 28],
          )
      ),
  );
}
Implementation
final Color color;