HelpAttribute - allows you to use HelpBox in the Unity inspector window - Unity Forum
c# - How to make GUI.Box corners rounded in Unity programmatically - Stack Overflow
Unity Tutorial 26 - GUI Boxes - YouTube
Unity - Manual: IMGUI Layout Modes
unity - Why when changing gui box color ith a color variable in the inspector in run time the color on a gui button is not the same? - Game Development Stack Exchange
The gui box is overloaded with the background - Questions & Answers - Unity Discussions