How to make a round blinking light on the GUI

i wanted to make a warning light on the GUI, and i have no idea of doing it,can any1 gave me some infomation on it thx alot.

Color button_blink = GUI.color;
button_blink.a = Mathf.Sin(Time.time * 8.0f);
GUI.color = button_blink;

                GUI.Button(new Rect(Screen.width * (4.9f/6.55f), Screen.height * (6.05f/6.55f),Screen.width * (.8f/6.55f), Screen.height * (.45f/6.56f)),""); //c#

make a round button with red color or what ver color you want in photo shop and apply it in custom style and put first three line of code in front of that GUI button it will start blinking like a waring signal


You can rotate GUI content by “GUIUtility.RotateAroundPivot”.
You can roatet any GUI content by this function.