import pygame, sys
from pygame.locals import *

pygame.init()

screen = pygame.display.set_mode((1600, 900))
pygame.display.set_caption('Task 1')

background = pygame.Surface((16, 9))

surface = pygame.Surface((10, 10))
surface.fill((0, 255, 0))

pos = [175, 125]

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
            elif event.key == pygame.K_LEFT:
                pos[0] -= 20
            if event.key == pygame.K_DOWN:
                pos[1] += 20
            elif event.key == pygame.K_UP:
                pos[1] -= 20
            surface.fill((pos[0] / 10, (pos[0] + pos[1]) / 20, pos[1] / 10))

    screen.blit(background, (0, 0))
    screen.blit(surface, pos)
    pygame.display.update()