---

import pygame

size = width, height = 301, 301
screen = pygame.display.set_mode(size)

running = True
x_pos = 0

while running:
    events = pygame.event.get()
    for event in events:
        if event.type == pygame.QUIT:
            running = False
    
    screen.fill((0, 0, 0))
    pygame.draw.rect(screen, (255, 0, 0), (x_pos, 200, 50, 50))
    x_pos += 1
    pygame.display.flip()

pygame.quit()