ios – How to change the background color of the content when is long pressed and is showing the contextMenu?

This is just an example of how ChatGPT transitions from a clear background to a dark gray background for the content of the message when contextMenu is visible. Here are my codes:

 struct ContentView: View {
   var body: some View {
        Text("Long press for menu")
            .background(.clear)
            .contextMenu {
                Button {
                    print("Pills selected")
                } label: {
                    Label("Pills", systemImage: "pills")
                }

                Button {
                    print("Heart selected")
                } label: {
                    Label("Heart rate", systemImage: "heart")
                }

                Button {
                    print("ECG selected")
                } label: {
                    Label("ECG", systemImage: "waveform.path.ecg")
                }
            }
    }