How to instantiate a prefab between Canvas and a Button?

I have prefab instantiating on Canvas but its image blocks the Button. So I need to make prefab instantiate between Canvas and the Button in 2d, I already tried to work with Z-axis but it doesn't help. Canvases Render Mode is Screen Space - Overlay. Here's the part of the code: GameObject barankas = Instantiate(baranka, new Vector3(Random.Range(-150, 150), Random.Range(-20, -150),Random.Range(20, 150)), Quaternion.identity) as GameObject; barankas.transform.SetParent(GameObject.FindGameObjectWithTag("Canvas").transform, false);