GUIStyle.margin

설명

The margins between elements rendered in this style and any other GUI elements.

This only has effect when using automatic layout (See Also: GUILayout).

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    private RectOffset rctOff;
    void OnGUI() {
        rctOff = GUI.skin.button.margin;
        Debug.Log("Left: " + rctOff.left + " Right: " + rctOff.right);
        Debug.Log("Top: " + rctOff.top + " Bottom: " + rctOff.bottom);
    }
}