// Update is called once per frame
void Update()
{
    if (Input.GetKeyDown(KeyCode.RightArrow))
    {
        gameObject.SetActive(false);
        NextSlide.PreviousSlide = this;
        NextSlide.gameObject.SetActive(true);
    }
    else if (Input.GetKeyDown(KeyCode.LeftArrow) && PreviousSlide != null)
    {
        gameObject.SetActive(false);
        PreviousSlide.gameObject.SetActive(true);
    }
}