How to scale GUI.Label depending on the screen size?

Hi, i searched a lot how to resize/scale the "Score: " + score depending on the screen size, but still i don't know, could you help me please.

using UnityEngine; using System.Collections;

public class GameOverScript : MonoBehaviour {

 int score = 0;
 
 void Start () {
     score = PlayerPrefs.GetInt ("Score");
 }
 

 void OnGUI () 
 {
     GUI.Label (new Rect(Screen.width / 2 - 40, 250, 80, 30), "Score: " + score);
 }

}