SwiftUI - Customising the frame in our indicator

Custom frame

struct ContentView: View {
    var body: some View {
        VStack {
            Text("SwiftUI")
            Indicator()
            
        }.frame(width: 150, height: 100, alignment: .center)
    }
}

struct Indicator: View {
    var body: some View {
        Rectangle().fill(Color.green)
    }
}