Weird white Stripe appearing next to tkinter scrollbar - python-3.x

Question

So while 'designing' my tkinter application i noticed this white stripe appearing next to the scrollbar there:
It is not disappearing when the scrollbar gets to an active state but it is definetly part of the Scrollbar itself because there is nothing under it in my programm which has a white background.
It seems to appear no matter if I use grid or pack. In this case I use grid - here the little extract of my code:
class App(Tk):
def __init__(self):
#other stuff
self.hvf=hvFrame(self,sticky=EW,showfocus=S,bg='white',padx=5,pady=5)
self.hvf.grid(row=1,column=0,columnspan=2,sticky=NSEW,pady=5,padx=(0,5))
sb=Scrollbar(self,orient=VERTICAL,command=self.hvf.yview,bd=0,highlightthickness=0)
sb.grid(row=1,column=2,sticky=NSEW,pady=5)
self.hvf.config(yscrollcommand=sb.set)
If you ned more, then here you go. (Should not be executable for you because you do not have the extras file but you should still be able to understand it.)
EDIT:
A little reproduceable example:
from tkinter import Tk,Frame,Scrollbar,VERTICAL,NS
root = Tk()
frame = Frame(root,height=300,width=500)
frame.grid(row=0,column=0,padx=(0,5),pady=5)
sb = Scrollbar(root,orient=VERTICAL)
sb.grid(row=0,column=1,sticky=NS,pady=5)
root.mainloop()

Answer 1

After testing a few things like changing the windows theme or changing the root and frame background to black the while line still comes up. I cannot be 100% sure but I believe this is due to fact that tkinter on Windows pulls the scrollbar design from Windows itself and it is simply part of that design. It may be a design choice to give the scroll bar some visual depth. That said you cannot do anything to change the design of the scrollbar within a Windows environment so you as stuck with this unless you write a custom scrollbar.
Example code:
import tkinter as tk
root = tk.Tk()
root['bg'] = 'black'
frame = tk.Frame(root, height=300, width=500, background='black')
frame.grid(row=0, column=0)
sb = tk.Scrollbar(root, orient=tk.VERTICAL)
sb.grid(row=0, column=1, sticky=tk.NS)
root.mainloop()
Results from overlay of white and black backgrounds:
Below is the code I use for a custom scrollbar (but did not write myself). You can find the post where I got the code here.