thickness property Null safety
final
The thickness of the scrollbar in the cross axis of the scrollable.
If null, the default value is platform dependent. On TargetPlatform.android, the default thickness is 4.0 pixels. On TargetPlatform.iOS, CupertinoScrollbar.defaultThickness is used. The remaining platforms have a default thickness of 8.0 pixels.
Implementation
final double? thickness;