tkinter-如何按帧调整屏幕大小？

Question

我正在关注tkinter的一些框架教程。我想知道如何更改屏幕尺寸。目前，屏幕尺寸会发生变化，但是当我更改背景颜色时，它不会影响整个屏幕。

from tkinter import *
import tkinter

class sign_in(tkinter.Tk):

    def __init__(self):
        tkinter.Tk.__init__(self)
        container = tkinter.Frame(self)
        container.pack(side="top", fill="both", expand=True)
        self.title("Snake Login")
        self.geometry("250x300")

        self.resizable(False, False)


        self.frames = {}
        for F in (StartPage, PageOne, PageTwo):
            page_name = F.__name__
            frame = F(parent=container, controller=self)
            self.frames[page_name] = frame

            frame.grid(row=0, column=0, sticky="nsew")

        self.show_frame("StartPage")

    def show_frame(self, page_name):
        frame = self.frames[page_name]
        frame.tkraise()


class StartPage(tkinter.Frame):

    def __init__(self, parent, controller):
        tkinter.Frame.__init__(self, parent)

        self.controller = controller
        self.configure(background="#1affff")
        label = tkinter.Label(self, text="This is the start page")
        label.place(x=10,y=10)

        button1 = tkinter.Button(self, text="Go to Page One",
                            command=lambda: controller.show_frame("PageOne"))
        button2 = tkinter.Button(self, text="Go to Page Two",
                            command=lambda: controller.show_frame("PageTwo"))
        button1.pack()
        button2.pack()

class PageOne(tkinter.Frame):

    def __init__(self, parent, controller):
        tkinter.Frame.__init__(self, parent)
        self.controller = controller
        label = tkinter.Label(self, text="This is page 1")
        label.place(x=100,y=100)
        button = tkinter.Button(self, text="Go to the start page",
                           command=lambda: controller.show_frame("StartPage"))
        button.place(x=50,y=30)


class PageTwo(tkinter.Frame):

    def __init__(self, parent, controller):
        tkinter.Frame.__init__(self, parent)
        self.controller = controller
        label = tkinter.Label(self, text="This is page 2")
        label.pack(side="top", fill="x", pady=10)
        button = tkinter.Button(self, text="Go to the start page",
                           command=lambda: controller.show_frame("StartPage"))
        button.pack()


if __name__ == "__main__":
    sign_in().mainloop()