diff --git a/src/gui/mainwindow.py b/src/gui/mainwindow.py
--- a/src/gui/mainwindow.py
+++ b/src/gui/mainwindow.py
@@ -1,7 +1,7 @@
 import logging as log
 import tkinter as tk
+from tkinter import N,S,E,W
 
-import PIL
 from PIL import ImageTk
 
 import config
@@ -25,7 +25,7 @@ class MainWindow(tk.Frame):
 		self._imgShift=EPoint(0,0)
 
 		tk.Frame.__init__(self, master)
-		self.grid(column=0,row=0)
+		self.grid(column=0,row=0,sticky=(N,S,E,W))
 		self._createWidgets()
 
 	def setCurrentFrame(self,frame):
@@ -46,15 +46,16 @@ class MainWindow(tk.Frame):
 	def _createWidgets(self):
 		# a captured frame with overlay graphics
 		self.imgView=tk.Canvas(self)
-		self.imgView.configure(width=480,height=360)
+		self.imgView.configure(width=480,height=360,background="#ff00ff")
 
 		self.imgView.bind('<1>',lambda e: self.addCorner(e.x,e.y))
 
-		self.imgView.grid(column=0,row=0)
+		self.imgView.grid(column=0,row=0,sticky=(N,S,E,W))
 
 		# board with detected stones
-		self.boardView= BoardView(self)
-		self.boardView.grid(column=1,row=0)
+		self._boardWrapper=tk.Frame(self,width=360,height=360)
+		self.boardView=BoardView(self._boardWrapper)
+		self._boardWrapper.grid(column=1,row=0,sticky=(N,S,E,W))
 
 		# more controls below the board
 		self.scaleTresB=tk.Scale(self, orient=tk.HORIZONTAL, length=200, from_=0.0, to=100.0, command=self.refreshTresholds)
@@ -64,6 +65,10 @@ class MainWindow(tk.Frame):
 		self.scaleTresB.grid(column=0,row=1,columnspan=2)
 		self.scaleTresW.grid(column=0,row=2,columnspan=2)
 
+		self.columnconfigure(0,weight=1)
+		self.columnconfigure(1,weight=1)
+		self.rowconfigure(0,weight=1)
+
 		# render everything
 		self.redrawImgView()