Navigation View Background Color

Hello. I have Navigation View with a List and 2 cells like this:

NavigationView {
            List{
                NavigationLink(destination: TabScene()) {
                // Cella 1
                 HStack {
                     Image(title[0].icon)
                     Text(title[0].title).font(.system(size: 30))
                 }
                }
                // Cella 2
                HStack {
                        Image(title[1].icon)
                        Text(title[1].title).font(.system(size: 30))
                    
                } // Con la tap sulla cella si attiva la State var a true
                .onTapGesture {
                    self.showTabView.toggle()
                } // Quando la state var va a true si presenta la scena desiderata.
                .sheet(isPresented: $showTabView, content: {
                    CreditsView()
                })
            }
                 .navigationBarTitle("ARPlanets 2")
                 .navigationViewStyle(DefaultNavigationViewStyle())
                 .listStyle(GroupedListStyle())
            }

Currently the background is white and it becomes black with the dark mode. Anyway i want to choose a custom background Color for my app.

How can i do that? So far i could not set a background Color for the Navigation View with a List embed inside it.