为什么我的图像按钮没有出现?

我试图在我的图像背景上的某个位置放置两个图像按钮，但我的按钮没有出现.我认为他们的图像在背景后面.

I am trying to place two image buttons on my image background in a certain position, but my buttons are not appearing. I think their images are behind the background.

我尝试使用 place 和 pack，两者都不起作用.可能是什么问题?

I tried to use place and pack, both did not work. What could be the problem?

from tkinter import*
import tkinter as tk
import settings

class Application(Frame):
    def __init__ (self, master):
        Frame.__init__(self,master)
        self.grid()
        self.create_widgets()

    def create_widgets(self):
        button1 = PhotoImage(file ="button1.gif")
        button2 = PhotoImage(file ="button2.gif")
        settings_button = Button(self, image = button1, 
                                 command = self.mult_command, width = 15)
        settings_button.place(x=1, y=1)
        rules_button = Button(self, image = button2, 
                              command = self.the_rules, width = 15)
        rules_button.place(x=50, y=50)

def main_code():
    window = Tk()
    window.title("The Bouncer")
    bg_image = PhotoImage(file ="pic.gif")
    x = Label (image = bg_image)
    x.image = bg_image
    x.place(x = 0, y = 0, relwidth=1, relheight=1)
    window.geometry("600x300")
    app = Application(window)
    window.mainloop()

main_code()

谢谢