Scale sprite problem

2D
1

I tried to scale my background sprite to the screen resolution, but it doesn’t work.
What am I doing wrong?

using UnityEngine;
using System.Collections;

public class ScaleBackground : MonoBehaviour {

    GameObject Background;

    // Use this for initialization
    void Start()
    {
        Background = GameObject.Find("Background");

        float windowWidth = Screen.width;
        float windowHeight = Screen.height;

        float spriteWidth = Background.transform.GetComponent<BoxCollider2D>().size.x * 100;
        float spriteHeight = Background.transform.GetComponent<BoxCollider2D>().size.y * 100;

        float backgroundWidth = windowWidth / spriteWidth;
        float backgroundHeight = windowHeight / spriteHeight;

        // Scale Sprite
        Background.transform.localScale = new Vector3(backgroundWidth, backgroundHeight, 0);
    }
    // Update is called once per frame
    void Update () {
   
    }
}
2

Have a look at an older post I did about, more or less, the same issue:

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