Simple question, have parsed numerous search results, haven't found a simple answer.  I set a very urgent button to red if something is not found so users click it first.  Once clicked, I want to set the background back to normal like button.config(bg='').  I tried 'grey' but it's not the right color.
What do I set it to?
The default background color of tkinter is #f0f0f0. Hope this helps ;)
How to reset background color of a python tkinter button?