How to center a rect in a gui.label

Questions & Answers
1

I feel kinda dumb asking this, but is there anyway to center a rect based on how long the sentence is?
Here is my script so far
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class TextScript : MonoBehaviour {

    public bool onLoad = false;
    [HideInInspector]public bool isLoaded = false;
    public string Text = "test of how long this sentence can be before it uncenters";

    private GUIStyle guiStyle = new GUIStyle();


    private void Start()
    {
        StartCoroutine(Wait());
        OnGUI();
        if (onLoad)
        {
            isLoaded = true;
        }
    }

    private void OnGUI()
    {
        guiStyle.fontSize = 20;
        guiStyle.normal.textColor = Color.white;
        if (onLoad)
        {
            if (isLoaded)
            {
                GUI.Label(new Rect(Screen.width / 2, Screen.height - 50, Screen.width, Screen.height), Text, guiStyle);
            }
        }
    }

    IEnumerator Wait()
    {
        yield return new WaitForSeconds(5);
        isLoaded = false;
    }
}

If i play the scene, the text doesn’t center with the rect. How do i figure this out?
Oh and this is unity GUI.label, not GUIText.

2

i found out how. I used guiStyle.alignment = TextAnchor.LowerLeft and changed the rect to (0, 0, Screen.width, Screen.height)