如何让相同的绘制对象同时出现？(pygame)

import pygame
pygame.init()

class Rectangle:
    def __init__(self, x, y, width, height):
        self.x = x
        self.y = y
        self.width = width
        self.height = height

    def draw(self, screen):
        pygame.draw.rect(screen, (255, 0, 0), (self.x, self.y, self.width, self.height))

rectangles = []
rectangles.append(Rectangle(100, 100, 50, 50))
rectangles.append(Rectangle(200, 200, 100, 50))

screen = pygame.display.set_mode((800, 600))
running = True

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

    screen.fill((255, 255, 255))

    for rectangle in rectangles:
        rectangle.draw(screen)

    pygame.display.flip()

pygame.quit()