Couple GUI questions

Unity Engine
1 
using UnityEngine;
using System.Collections;

public class GUI_Dialogue : MonoBehaviour {
	
	private const float cRefResolutionX = 1920.0f;
	public Texture2D icon;
	
	// Use this for initialization
	void Start () 
	{
	}
	
	void OnGUI()
	{
		float dialIconCenterX = -0.2f;
		float dialIconCenterY = 0.18f;
		float dialIconSizeX = 0.08f;
		float dialIconSizeY = 0.08f;
		
		float dialTextSizeX = 0.35f;
		float dialTextSizeY = 0.08f;

        // compute GUI scale based on x screen width and reference resolution
        float guiScale = Screen.width / cRefResolutionX;
		
		// Face icon GUI box positioning
        float dialIconSX  = dialIconSizeX * guiScale * cRefResolutionX;
        float dialIconSY  = dialIconSizeY * guiScale * cRefResolutionX;
        float dialIconL   = ( Screen.width - dialIconSX ) * 0.5f + dialIconCenterX * guiScale * cRefResolutionX;
        float dialIconR   = ( Screen.height - dialIconSY ) * 0.5f + dialIconCenterY * guiScale * cRefResolutionX;
		
		// Text box GUI box positioning
        float dialTextSX  = dialTextSizeX * guiScale * cRefResolutionX;
        float dialTextSY  = dialTextSizeY * guiScale * cRefResolutionX;
        float dialTextL   = ( Screen.width - dialTextSX ) * 0.5f + dialIconCenterX * guiScale * cRefResolutionX * -0.1f;
        float dialTextR   = ( Screen.height - dialTextSY ) * 0.5f + dialIconCenterY * guiScale * cRefResolutionX;
		
		GUI.color = Color.white;
		GUI.Box(new Rect(dialIconL, dialIconR, dialIconSX, dialIconSY), icon);
		GUI.Box(new Rect(dialTextL, dialTextR, dialTextSX, dialTextSY), "AHHHHHHHHHHHH!");
	}
	
	// Update is called once per frame
	void Update () {
	
	}
}

The above code gives me this result:

892×206 111 KB

How can I make the text font size bigger and placed in the center (in y-axis) of the text box?

Also, I need to make both boxes stand out more, is there anything that involves with changing the background color or changing the outline color of the boxes?

2

You’ll need to create a GUISkin.

3

Ah! I wish I had known about this sooner. This makes life 1000x simpler.
Thanks!