aim instantiated GUI text at camera

I am instantiating a canvas with a text child. I want the text to aim at the camera. The code I am trying is:

     Instantiate(canvas, pos, canvas.transform.rotation   );
         GameObject cam = GameObject.FindWithTag("MainCamera");
         target = cam.transform;
         canvas.transform.LookAt(target);

the canvas/text appears in the right place, but the text does not aim at the target. any help is greatly appreciated.