Proportional text screen

Hello, this script works perfectly, the only problem is the lack of proportionality of the text in the screen, I would like GUI.Box, GUI.Label and icon texture2D decreases along with the screen. Help please

The script is this:

var close = false;

var textFieldString = "write here";

var icon : Texture2D;

var style : GUIStyle;

function SetTheGUI () {

 close = true;

}

function UnSetGUI () {

 close = false;

}

function OnGUI () {

 if(close) {

 

 GUI.Box (Rect (10,10,300,800), icon);

 GUI.Label (Rect(25, 180, 250, 750),textFieldString, style);

         

}

}