import pygame
import sys

pygame.init()
screen = pygame.display.set_mode((400, 300))
background = pygame.Surface((400, 300))
background.fill((0, 0, 0))  # Fill with black

surface = pygame.Surface((50, 50))
surface.fill((0, 255, 0))  # Green square

pos = [177, 125]
clock = pygame.time.Clock()

while True:
    events = pygame.event.get()
    for event in events: 
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RIGHT:
                pos[0] += 20

    screen.blit(background, (0, 0))
    screen.blit(surface, pos)    
    pygame.display.update()
    clock.tick(60)  # Add this to reduce CPU usage