How to set border color of certain Tkinter widgets?

Question

I\'m trying to change the background color of my Tkinter app, but for certain widgets it leaves a white border around the edges.

For example, this:

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Answer 1

Just use

widget.config(highlightbackground=COLOR)

Furthermore, if you don't want that border at all, set the highlightthickness attribute to 0 (zero).

Answer 2

You have to set the two highlights (with and without focus) to have a continuous color.

from tkinter import *
root = Tk()
e = Entry(highlightthickness=2)
e.config(highlightbackground = "red", highlightcolor= "red")
e.pack()
root.mainloop()