Change Button Image

#=======================================================================
########################################################################
#=========================== Left Frame File ===========================

import customtkinter as ctk


class LeftFrame:

    def __init__(self, master, changeColorFunc = None):

        self.main_frame = ctk.CTkFrame(master)
        self.main_frame.pack()
        self.main_theme = ctk.get_appearance_mode()
        self.is_dark_mode = True

        self.changeColor = lambda theme : changeColorFunc(theme)

        self.dark_mode_toggle = ctk.CTkSwitch(self.main_frame, command=self.changeTheme)
        self.dark_mode_toggle.pack()

    def changeTheme(self):

        if self.is_dark_mode:
            self.main_theme = "Light"
            self.is_dark_mode = False
            ctk.set_appearance_mode(self.main_theme)
            self.changeColor(self.main_theme)

        else:
            self.main_theme = "Dark"
            self.is_dark_mode = True
            ctk.set_appearance_mode(self.main_theme)
            self.changeColor(self.main_theme)


#========================================================================
#########################################################################
#=========================== Right Frame File ===========================

import customtkinter as ctk
from PIL import ImageTk, Image

class RightFrame:

    def __init__(self, master = None):

        self.main_frame = ctk.CTkFrame(master)
        self.main_frame.pack()

        #============ Images for button ============

        self.github_logo_black = ImageTk.PhotoImage(Image.open(f"{self.PATH}/src/images/ui/github32_b.png"))
        self.github_logo_white = ImageTk.PhotoImage(Image.open(f"{self.PATH}/src/images/ui/github32_w.png"))  # unused


        #=========== Button ============

        self.btn_github = ctk.CTkButton(self.main_frame,
                                          text="GitHub",
                                          image=self.github_logo_black,
                                          command=self.changeButtonColor)
        self.btn_github.pack()
        self.btn_github.configure(image=self.github_logo_black)


    def changeButtonColor(self, mode):

        if mode == "Dark":
            self.btn_github.configure(image=self.github_logo_white)

        elif mode == "Light":
            self.btn_github.configure(image=self.github_logo_black)

#========================================================================
#########################################################################
#=========================== Main Window File ===========================

import customtkinter as ctk
from left_frame import LeftFrame
from right_frame import RightFrame

class App:

    def __init__(self):

        self.main = ctk.CTk()

        self.right = RightFrame(self.main)
        self.left = LeftFrame(self.main, changeColorFunc=self.right.changeButtonColor)


        self.main.mainloop()