[tkinter] color change for hovering over button

[menator01]

Using bind events

#! /usr/bin/env python3

import tkinter as tk

def on_leave(event):
    btn['bg'] = 'yellow'

def on_enter(event):
    btn['activebackground'] = 'blue'

root = tk.Tk()
root.geometry('200x200')
btn = tk.Button(text='Button')
btn['font'] = 'sans 18 normal'
btn.pack()
btn.bind('<Leave>', on_leave)
btn.bind('<Enter>', on_enter)
root.mainloop()