public IEnumerator FadeIn()
{
_colorMenu.gameObject.SetActive(true);
_colorMenu.transform.GetChild(0).gameObject.SetActive(true); // panel hidden by default
CanvasGroup cg = _colorMenu.GetComponent <CanvasGroup>();
cg.alpha = 0f;
while (cg.alpha != 1f)
{
cg.alpha = Mathf.MoveTowards(cg.alpha, 1f, Time.deltaTime / 2f);
yield return(new WaitForEndOfFrame());
}
}