Boilerplate for using the arc theme in tkinter
# must pip install tkinter and pip install ttkthemes
# list of themes & theme reference:
# https://ttkthemes.readthedocs.io/en/latest/themes.html
import tkinter as tk
from tkinter import ttk
from ttkthemes import ThemedTk
window = ThemedTk(theme="arc")
ttk.Button(window, text="Quit", command=window.destroy).pack()
window.mainloop()