How do you adjust the height and borderRadius of a BottomSheet in Flutter?

Default height for bottomSheet is half the screenSize

If you want your bottomSheet to EXPAND according to your content DYNAMICALLY

use below code

showModalBottomSheet<dynamic>(
isScrollControlled: true,
context: context,
builder: (BuildContext bc) {
  return Wrap(
      children: <Widget>[...]
  )
 }
)

This will automatically expand the bottomSheet according to content inside.

For adding a radius on top of bottomSheet return below code to `bottomSheet’

Container(
  child: Container(
    decoration: new BoxDecoration(
      color: forDialog ? Color(0xFF737373) : Colors.white,
      borderRadius: new BorderRadius.only(
            topLeft: const Radius.circular(25.0),
            topRight: const Radius.circular(25.0))),
      child: yourWidget(),
   ),
)

Complete code meeting both requirements

showModalBottomSheet<dynamic>(
isScrollControlled: true,
context: context,
builder: (BuildContext bc) {
  return Wrap(
      children: <Widget>[
          Container(
                 child: Container(
                  decoration: new BoxDecoration(
                    color: forDialog ? Color(0xFF737373) : Colors.white,
                    borderRadius: new BorderRadius.only(
                          topLeft: const Radius.circular(25.0),
                          topRight: const Radius.circular(25.0))),
                    child: yourWidget(),
                 ),
              )
      ]
   )
 }
)