title: how to set a theme for ttkthemes for python3 in windows10?
body: <p>I'm trying to style my <code>tkinter</code> GUI with some theme from ttkthemes.
  I have found this code :</p>
  
  <pre><code>from ttkthemes import ThemedStyle
  import tkinter as tk
  from tkinter import ttk
  
  app = tk.Tk()
  app.title('App')
  
  style = ThemedStyle(app)
  style.set_theme("black")
  
  tktext = tk.Label(app, text=" tk Label")
  tktext.pack()
  tkbutton = tk.Button(app, text="tk Button")
  tkbutton.pack()
  
  text = ttk.Label(app, text=" ttk Label")
  text.pack()
  button = ttk.Button(app, text="ttk Button")
  button.pack()
  
  app.geometry('200x200')
  
  app.mainloop()
  </code></pre>
  
  <p>in this topic : 
  <a href="https://stackoverflow.com/questions/51697858/python-how-do-i-add-a-theme-from-ttkthemes-package-to-a-guizero-application#">Python - How do I add a theme from ttkthemes package to a guizero application?</a></p>
  
  <p>but I have a problem with that and that's when I run the program the theme doesn't cover whole root windows and just the buttons or labels from <code>ttk</code> are taking the theme (using windows10).I have tried in some other codes and everytime the same problem.
  What's Problem with that?
  <a href="https://i.stack.imgur.com/ZvhiK.png" rel="nofollow noreferrer">ttktheme</a></p>