Unity objects are always in the center of the viewport

Hang this code under the camera

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Trace : MonoBehaviour {

	// Use this for initialization
	void Start () {
		
	}
	
	// Update is called once per frame
	void Update () {
        float x = Input.GetAxis("Horizontal");//Rotate the camera
        float y = Input.GetAxis("Vertical");
        gameObject.transform.RotateAround(gameObject.transform.position, Vector3.up, x);
        gameObject.transform.RotateAround(gameObject.transform.position, Vector3.right, y);

        GameObject cube = GameObject.Find("Cube");//Require the object facing the camera
        cube.transform.RotateAround(gameObject.transform.position, Vector3.up, x);
        cube.transform.RotateAround(gameObject.transform.position, Vector3.right, y);

    }
}

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