title: How to remove small border from fullscreen canvas in Tkinter
body: <p>When using a fullscreen canvas, such as in the following code:</p>
  
  <pre><code>from tkinter import *
  
  root = Tk()
  root.attributes("-fullscreen", True)
  
  canvas = Canvas(root, background = "red")  # I use a red background for visibility.
  canvas.pack(fill = BOTH, expand = True)
  </code></pre>
  
  <p>I get a small (2 pixel) border around my entire screen. This happens on any computer I test the code on.</p>
  
  <p>Is there a way I can remove this border, as in have the canvas fill in the entire screen up to the very edge?</p>
  
  <p><a href="https://i.stack.imgur.com/783c9.png" rel="nofollow noreferrer">Image of my full screen, with the fullscreen canvas</a></p>
  
  <p>Thanks</p>