Animating the text labels

Now, let’s add two labels that can act as a guide for the user to watch their breath. Still working in the ZStack and moving directly underneath the previous line of code, add another ZStack, and fill it with the following:

//MARK: - ANIMATE TEXT LABELS SO THEY GROW AND SHRINK
  //a ZStack so we can offset the entire scene vertically
  ZStack {
     Group {
        Text("Breathe In")
             .font(Font.custom("papyrus", size: 35))
             .foregroundColor(Color(UIColor.green))
             .opacity(breatheInLabel ? 0 : 1)
             .scaleEffect(breatheInLabel ? 0 : 1)
 ...