Adjust Scrollbar height and width in Flutter

How to adjust Scrollbar height and width.

Scrollbar(
    child: ListView(
      padding: const EdgeInsets.all(15.0),
      children: [
        const Text(
          'Red Hat Installation in VirtualBox',
          style: darktext2,
        ),
        ] ), )

>Solution :

You can use thickness,

Scrollbar(
  thickness: 33, //this
  child: ListView(