如何在tkinter中居中我的滚动条内容？

import tkinter as tk
from tkinter import ttk

def center_scrollbar_content():
    root = tk.Tk()
    root.title("居中滚动条内容")
    root.geometry("400x300")

    # 创建滚动条控件
    scrollbar = ttk.Scrollbar(root)
    scrollbar.pack(side=tk.RIGHT, fill=tk.Y)

    # 创建滚动区域
    canvas = tk.Canvas(root, yscrollcommand=scrollbar.set)
    canvas.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)

    # 将滚动区域与滚动条关联
    scrollbar.config(command=canvas.yview)

    # 创建内容区域
    content_frame = tk.Frame(canvas)
    canvas.create_window((0, 0), window=content_frame, anchor=tk.NW)

    # 设置内容区域的大小
    content_frame.bind("<Configure>", lambda event: canvas.configure(scrollregion=canvas.bbox("all")))

    # 创建需要滚动的内容
    label = tk.Label(content_frame, text="这是需要居中的内容", font=("Arial", 16))
    label.pack(pady=50)

    # 将内容区域居中
    canvas.update_idletasks()
    canvas_width = canvas.winfo_width()
    canvas_height = canvas.winfo_height()
    content_width = content_frame.winfo_reqwidth()
    content_height = content_frame.winfo_reqheight()
    x_offset = (canvas_width - content_width) // 2
    y_offset = (canvas_height - content_height) // 2
    canvas.configure(scrollregion=(0, 0, content_width, content_height))
    canvas.xview_moveto(0)
    canvas.yview_moveto(0)
    canvas.move(content_frame, x_offset, y_offset)

    root.mainloop()

center_scrollbar_content()