Swiftui Close button

CloseButton.swift

    func closeButton(reader: GeometryProxy) -> some View {
        Button(action: {
            self.selectedPoster = nil
        }) {
            Circle()
                .strokeBorder(Color.red, lineWidth: 1)
                .background(Image(systemName: "xmark").foregroundColor(.red))
                .frame(width: 50, height: 50)
            
        }
        .scaleEffect(self.innerSelectedPoster != nil ? 0 : 1)
        .position(x: reader.frame(in: .local).midX,
                  y: reader.frame(in: .local).maxY - 40)
    }