GUI.Button style android problem

Hello.

My problem is that i want to make text in my GUI.Button bigger, so i created new GUIStyle and applied it to my buttons. And here comes my problem, because this solution works in Unity Editor (and buttons looks like default buttons, only with larger text font), but after building apk and running it on my android device buttons looks strange - no background or borders, only text in changed color. Not sure whats the problem, if somebody could help me i would be very grateful.

Code example of my method:

GUIStyle buttonStyle1;

buttonStyle1 = new GUIStyle("button");
buttonStyle1.fontSize = 44;

Rect tabButton1= new Rect ((Screen.width * 5 / 100), (Screen.height * 1 / 100), (Screen.width * 25 / 100), (Screen.height * 13 / 100));

if (GUI.Button (tabButton1, "STATS",buttonStyle1)){}

Thanks for any response.

I menaged to solve this problem so thread is about to close.