Как настроить размер шрифта под размер кнопки в tkinter?

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import tkinter as tk

def increase_font(button):
    current_font_size = button['font'].split()[1]
    new_font_size = int(current_font_size) + 2
    button.configure(font=('Arial', new_font_size))

root = tk.Tk()
root.geometry('200x100')

button = tk.Button(root, text='Click me', width=10, height=2, font=('Arial', 10))
button.pack()

increase_font_button = tk.Button(root, text='Increase font size', command=lambda: increase_font(button))
increase_font_button.pack()

root.mainloop()