I have to display like the following , used three VStacks to display it. However the login VStack is to the bottom of the screen. How to place it to the center of the screen and Google image to the top most of the screen

    struct Login: View {
       var body: some View {
      ZStack{
                CustomNavigationBar() // To diplay image
              VStack{
                LoginView(lgnvwmmodel: lgnvwmmodel) //To display Login View
                HelpView()
                }
            }
    }
    
    }



struct CustomNavigationBar: View{
    var body: some View{
        NavigationView{
        Image(uiImage: UIImage(named: "google.png")!)
        } .navigationViewStyle(StackNavigationViewStyle())
            .navigationBarTitleDisplayMode(.inline)
            .padding(0)
    }
}

struct LoginView: View {
    
    @State private var emailId: String = ""
    @State private var password: String = ""
    @State var ntwrkShowAlert = false
    @State private var success = false
    @State var isModal:Bool = false
    @EnvironmentObject var DataGetting : DataStorage
    @ObservedObject var monitor = NetworkMonitor()
    @State private var isEmailValid : Bool   = true
    @State private var showingAlert = false
    @State var chngpasscode = false
    @State var btnClicked:CancelClicked = .none
    @State var showPopup = false
    @ObservedObject var lgnvwmmodel : LoginViewModel
   var body: some View {
       Text("Login")
            .font(.custom("OpenSans-Bold", size: 24))
            .padding(.top, 100)
        
        
        TextField("Email ID", text: $emailId)
            .onReceive(Just(emailId), perform: { _ in
                if emailId.count >= 50{
                    emailId = String(emailId.prefix(50))
                }
            })
            .modifier(customViewModifier(roundedCornes: 6,  textColor: .black))
            .frame(height: 100)
            .padding([.leading, .trailing], 100)

        
        SecureField("Password", text: $password)
            .onReceive(Just(password), perform: { _ in
                if password.count >= 50{
                    password = String(password.prefix(50))
                }
            })
            .modifier(customViewModifier(roundedCornes: 6,  textColor: .black))
            .frame(height: 100)
            .padding([.leading, .trailing], 100)
        
       
        
        
        Button(action: {
            
        }, label: {
            Text("Forgot Password ?")
                .underline()
                .frame( height: 40, alignment: .trailing)
                .padding(.leading, 320)
            
        })
        
        Button(action: {
     
            if(DataGetting.strEmail == ""){
    UserDefaults.standard.setValue(self.emailId, forKey:"Email")
            }
            if((DataGetting.strPassword) == 0){
                UserDefaults.standard.setValue(self.password, forKey: "Password")
            }
            
            
            self.isModal = true



            if(monitor.status == .connected){
                self.ntwrkShowAlert = false
                lgnvwmmodel.dataStorage = DataGetting
            lgnvwmmodel.getUserIdDetails(emailId: emailId, password: password){ status in
                do {
                    if(status){
                       
                        success = true
                            
                    }
                }
            }
            
            }
            else{
                self.ntwrkShowAlert = true
                    
            }
            
            
        }, label: {
            Text("Sign In")
                .frame(width: 200, height: 30)
                .padding()
                .background(Color.red)
                .foregroundColor(Color.white)
                .font(.custom("OpenSans-Bold", size: 28))
            
        }).alert(isPresented: $ntwrkShowAlert){
      
      return Alert(title: Text("Please check your internet connection"), message: Text(""), dismissButton: .default(Text("OK")))
          }

        
       
       
    }


}

struct HelpView: View{
    @State private var isAlert = false
    @State private var errorMessage: String = ""
    var body: some View{
    Button(action: {
        
    }, label: {
        Text("Help")
            .frame(minWidth: 0, maxWidth: .infinity, maxHeight: 80)
            .background(Color.red)
            .foregroundColor(Color.white)
            .font(.custom("OpenSans-Bold", size: 28))
    }).alert(isPresented: $isAlert){
        Alert(title: Text(self.errorMessage), message: Text(""), dismissButton: .default(Text("OK")))
    }
}
}