code

import tkinter as tk

LARGE_FONT= ("Verdana", 14)

class MathsQuizapp(tk.Tk):

    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)

        container = tk.Frame(self)
        container.pack(side="top", fill="both", expand = True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        self.frames = {}

        frame = NamePage(container, self)

        self.frames[NamePage] = frame

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

        self.show_frame(NamePage)

    def show_frame(self, cont):

        frame = self.frames[cont]
        frame.tkraise()

class NamePage(tk.Frame):

    def _init__(self, *args, **kwargs):
        tk.Frame.__init__(self, parent)
        label = tk.label(self, text="Please enter your name", font=LARGE_FONT)
        label.pack(pady=10, padx=10)

app = MathsQuizapp()
app.mainloop()