import pygame, random

class Target(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.image = pygame.Surface((45,45))
        self.image.fill((255,255,0))
        self.rect = self.image.get_rect()
        self.x = random.randrange(20, 1004)
        self.y = random.randrange(20, 748)
        self.rect.center = (self.x, self.y)

class crosshair(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.image = pygame.Surface((10,10))
        self.image.fill((255,0,0))
        self.rect = self.image.get_rect()
        self.rect.center = (0, 0)

    def update(self):
        position = pygame.mouse.get_pos()
        self.rect.center = position

pygame.init()
window = pygame.display.set_mode((1024, 768))
run = True
pygame.mouse.set_visible(False)
aim = crosshair()
sprites = pygame.sprite.Group()
sprites.add(aim)
while run:
    window.fill((0,0,0))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
    sprites.update()
    sprites.draw(window)
    pygame.display.update()
pygame.quit()