Pong: Placing Gameobjects in a way that will work with any resolution

Hello,

I've just finished making a pong clone in 1024*768. When I build the game, in most resolutions, a wider screen area is being displayed than in the game's native resolution. In particular, varying amounts of space behind the paddles is being displayed.

I'd like some way to make the game consistent across resolutions. I've started by trying to scale the walls (thin horizontal cubes at the top and the bottom of the screen, for the balls to bounce off), but it doesn't seem to be working. This is the script I'm attaching to the walls:

 using UnityEngine;
 using System.Collections;
 
 public class ScaleScript : MonoBehaviour 
 {
     public GameObject attached;
     
     // Use this for initialization
     void Start () 
     {
         // Get the gameobject this script is attached to
         attached = this.gameObject;
         
         // Get the scale of the attached gameobject
         Vector3 scale = attached.transform.localScale;
         
         // Multiply the scale by the screenWidth divided by the native Screen Width
         scale.x = scale.x * (IntroGui.screenWidth/1024);
         
         // Resize the attached gameobject's transform
         transform.localScale = scale;
         
     }
     
 }