Help with GUI class

Hi everyone!

Does anyone know why would I not see this in the Game view on Play mode?

   public AudioClip beep;
         public GUISkin menuSkin;
         public Rect menuArea;
         public Rect playButton;
         public Rect instructionsButton;
         public Rect quitButton;
     
         void OnGui (){
             GUI.skin = menuSkin;
             GUI.BeginGroup (menuArea);
             if(GUI.Button(new Rect(playButton), "Play")){
                 audio.PlayOneShot(beep);
             }
             if(GUI.Button(new Rect(instructionsButton), "Instructions")){
                 audio.PlayOneShot(beep);
             }
             if(GUI.Button(new Rect(quitButton), "Quit")){
                 audio.PlayOneShot(beep);
             }
             GUI.EndGroup ();