Flutetr Steeper Color

Wrap your stepper in a Theme Widget.

Theme(
    data: ThemeData(
                  accentColor: Colors.orange,
                  primarySwatch: Colors.orange,
                  colorScheme: ColorScheme.light(
                    primary: Colors.orange
                  )
                ),
    child: Stepper(
       steps: []
    ))
Powerful Polecat