如何在pygame中移动y轴，而只将文本在x轴上居中？

import pygame
pygame.init()

window_width = 800
window_height = 600
window = pygame.display.set_mode((window_width, window_height))

font = pygame.font.Font(None, 36)

text = font.render("Hello, World!", True, (255, 255, 255))

text_width = text.get_width()
text_height = text.get_height()

text_x = (window_width - text_width) // 2  # 在x轴上居中
text_y = 0  # 初始位置在窗口顶部

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    # 移动文本的y轴位置
    text_y += 1

    # 清空窗口
    window.fill((0, 0, 0))

    # 绘制文本
    window.blit(text, (text_x, text_y))

    # 更新窗口显示
    pygame.display.flip()

pygame.quit()