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

   var body: some View {
      ScrollView(.horizontal, showsIndicators: false) {
         LazyHStack(spacing: 0) {
            ForEach(appData.userData) { book in
               CellBook(book: book)
                  .containerRelativeFrame(.horizontal, count: 2, span: 1, spacing: 0)
            }
         }
     }
     .scrollTargetBehavior(.paging)
   }
}