import pygame
from pygame.locals import *
import sys

pygame.init()

displaySurface = pygame.display.set_mode((300, 300))

mySurface = pygame.Surface ((50, 50))
mySurface.fill((0,255,0))

mySurface2 = pygame.Surface((100, 50))
mySurface2.fill((0,255,0))



screen = pygame.display.set_mode((400, 300))
background = pygame.Surface((400,300))

pos = [175, 125]

while True:
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()

        screen.blit(background, (0, 0))
        screen.blit(mySurface, pos)

    pygame.display.update()