How to remove black border when GUI is selected?

Question

I am trying to add an Entry widget to a Frame with a Scrollbar. When I click on the GUI, a black border appears:

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Answer 1

To remove the border of your widgets (for example of a Text widget) set the highlightthickness attribute to 0.

Here, you have a working example:

import tkinter as tk

class Example(tk.Frame):
    def __init__(self, master):
        tk.Frame.__init__(self, master)
        self.text = tk.Text(self, highlightthickness=0)
        self.text.pack(expand=1, fill='both')

root = tk.Tk()
Example(root).pack(expand=1, fill='both')
root.mainloop()