How to style and customize tkinter/guizero menu bar?

Question

I am working with Tkinter and guizero and am trying to style the menu bar.I am using Python 3.8.2

Things I am trying to change

1. Remove the border/3D effect on the menu bar and options.

2. Remove the menu bar top padding(the little space above and on the left side).

3. Active select color for both toplevel/menu bar and options.

from guizero import App, MenuBar

def file_function():
    print("File option")

def about_function():
    print("about option")

app = App(title="My app", height=300, width=500,bg='white')
menubar = MenuBar(app,
                    toplevel=["File", "About"],
                    options=[
                        [ ["New", file_function], ["Save", file_function]],
                        [ ["Report Bug", about_function], ["About", about_function] ]
                    ])

menubar.bg=(111, 77, 124)

# none of the styling below works and this is what I've tried
menubar.border=0
menubar.toplevel.border=False
menubar.options.border=0
menubar.toplevel.options.bg='gray'
menubar.toplevel.focus.bg='yellow'
menubar.toplevel.focus.fg='yellow'
menubar.toplevel.options.border=False
app.display()

Image:

Update

The menu is not meant to currently look good the strange colors are to see what does and doesn't works. I am able to use guizero widget and all of their functionality.

Current Problems

1. Unable to remove 3d/possible padding effect on menu and sub menu when item is selected

I have tried setting border to 0 and highlightthickness to 0

Updated code

from guizero import *
from tkinter import *

app=App(title='Test',bg=(53, 60, 81))
root = app.tk

def hello():
    print ("hello!")


#creates menubar
menubar = Menu(root,relief=FLAT,bd=0)




# Sets menubar background color and active select but does not remove 3d  effect/padding
menubar.config(bg = "GREEN",fg='white',activebackground='red',activeforeground='pink',relief=FLAT)


# First item on menubar and creates sub options
filemenu = Menu(menubar, tearoff=0,relief=FLAT, font=("Verdana", 12),activebackground='red')
filemenu.config(bg = "GREEN") 
filemenu.add_command(label="New (Ctrl + N)", command=hello)
filemenu.add_command(label="Save(Ctrl + S)", command=hello)
filemenu.add_separator()
filemenu.add_command(label="Exit", command=root.quit)
menubar.add_cascade(label="File", menu=filemenu)



# Adds to menubar and creates sub options
editmenu = Menu(menubar, tearoff=0)
editmenu.add_command(label="Cut", command=hello)
editmenu.add_command(label="Copy", command=hello)
editmenu.add_command(label="Paste", command=hello)
menubar.add_cascade(label="Edit", menu=editmenu)

helpmenu = Menu(menubar, tearoff=0,bg='green',fg='blue')

helpmenu.add_command(label="Report bug", command=hello)
helpmenu.add_command(label="About", command=hello)
menubar.add_cascade(label="Help", menu=helpmenu)

helpmenu.activebackground='red'



root.config(menu=menubar)
app.display()

Answer 1

I have broken down the following code. You do need to import tkinter first or it will throw an error.

from tkinter import * 
from guizero import *


#background can be set rgb values,color name, and hex values
# width and height set the defualt startup window size
app=App(title='Test',bg=(53, 60, 81),width=500,height=500)

#sets min and max size of window
app.tk.minsize(width=250,height=250)
app.tk.maxsize(width=550,height=550)

root = app.tk


#Basic test function
def hello():
    print ("hello!")
    
    
        
    
#creates the menubar and sets the location to root window
menubar = Menu(root,relief=FLAT,bd=0)


'''
bg sets the menubar background color
fg sets the text color
activebackground sets the selected item background
activeforeground set the selected item text color
active borderwidth removes the 3d effect/border around item
font sets the font type and size
Defualt text,background and other things can be set with variables

'''

menubar.config(bg = "GREEN",fg='white',activebackground='red',activeforeground='purple',activeborderwidth=0,font=("Verdana", 12))


# create a pulldown menu, and add it to the menu bar
# background,foreground and bother border and active border width needs to be set to remove any 3d border effect
filemenu = Menu(menubar, tearoff=0,relief='flat', bd=0,activebackground='red',activeborderwidth=0,font=("Verdana", 12))
filemenu.config(bg = "GREEN") 
filemenu.add_command(label="New", command=hello)
filemenu.add_command(label="Save", command=hello)
#add line between drop down menu items
filemenu.add_separator()
filemenu.add_command(label="Exit", command=root.quit)
# sets the top level menu list name
menubar.add_cascade(label="File", menu=filemenu)





# create a pulldown menu, and add it to the menu bar
#example of no styling added to the sub menu
editmenu = Menu(menubar, tearoff=0)
editmenu.add_command(label="Cut", command=hello)
editmenu.add_command(label="Copy", command=hello)
editmenu.add_command(label="Paste", command=hello)
# sets the top level menu list name
menubar.add_cascade(label="Edit", menu=editmenu)

# create a pulldown menu, and add it to the menu bar
# show custom effects can be add to each sub menu 
helpmenu = Menu(menubar, tearoff=0,bg='orange')
helpmenu.add_command(label="Report bug", command=hello)
helpmenu.add_command(label="About", command=hello)
# sets the top level menu list name
menubar.add_cascade(label="Help", menu=helpmenu)




# example of guizero widget
box = Box(app,height=200,width=500)
box.set_border(thickness=2, color='green')
box.bg=(53, 60, 81)
box.text_color='white'
exampel_text = Text(box, text="Hello World")
Picture(box,"example.png")


# display the menu and other things
root.config(menu=menubar)
app.display()