Same Background Color for Visible and Invisible Area of the Agent

[chengzu-li]

Hi, thanks for releasing mini-behavior. I'm trying to use the same background color for both visible and invisible area of the agent, while the current implementation uses different color for these areas (visible area with light gray). I would appreciate it if you could tell me which part of the code I'm supposed to modify / look into in the codebase. Thanks!

[JiahengHu]

Setting highlight=False when calling render() should do the trick.