The main reason of the missing button is that you are using "absolute position / size" but you put a "true" in "relative" argument which means you need "relative position / size".
There's one in community.mtasa.com : https://community.multitheftauto.com/index.php?p=resources&s=details&id=7613
Or DGS has also implemented 3d text : https://wiki.multitheftauto.com/wiki/DgsCreate3DText