Version: 2017.3
public GUIStyle verticalScrollbarThumb ;

説明

GUI.VerticalScrollbar の thumb (つまみ部分)で使用されるスタイル

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { public float hSbarValue; public GUIStyle style; void OnGUI() { GUI.skin.verticalScrollbarThumb = style; hSbarValue = GUILayout.VerticalScrollbar(hSbarValue, 1.0F, 0.0F, 10.0F); } }