Box Collider resize with object Unity

The video will display the Collider box that changes according to the size of the object, when the object changes the size

 [SerializeField] BoxCollider2D box_2d;

    [SerializeField] RectTransform rectTransform;

    [SerializeField] float distanceToCover;

    [SerializeField] float speed;

    [SerializeField] float wisthsize;

    [SerializeField] float heightsize;

    Vector3 temp;

   

    void Start()

    {

        box_2d = GetComponent<BoxCollider2D>();

        rectTransform = GetComponent<RectTransform> ();

       temp = transform.localScale;

    }

    // Update is called once per frame

    void Update()

    {

        Vector3 v= temp;

        v.x += distanceToCover * Mathf.Sin(Time.time*speed);

        v.y += distanceToCover * Mathf.Sin(Time.time*speed);

       

        var rect = rectTransform.rect;

        box_2d.size = new Vector2 (rect.width-wisthsize, rect.height-heightsize);

       transform.localScale = v;

 

    }

Video