struct ContentView: View {
   @Environment(ApplicationData.self) private var appData

   var body: some View {
      List {
         HStack {
            Image(systemName: "book.circle")
               .font(.largeTitle)
            Spacer()
            Text("My Favorite Books")
               .font(.headline)
         }.frame(height: 50)
         ForEach(appData.userData) { book in
            CellBook(book: book)
         }
      }.listStyle(.plain)
   }
}