Revise paste Untitled

import pygame as pg
pg.init()

SCREEN_WIDTH = 256
SCREEN_HEIGHT = 640

clock = pg.time.Clock()
FPS = 60
screen = pg.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
pg.display.set_caption('Flappy Bird', 'Assets/yellowbird-downflap.png')

bg = pg.image.load('Assets/background-day.png')
ground_img = pg.image.load('Assets/base.png')

class Bird(pg.sprite.Sprite):
    def __init__(self, x, y):
        pg.sprite.Sprite.__init__(self)
        self.image = pg.image.load('Assets/redbird-downflap.png')
        self.rect = self.image.get_rect()
        self.rect.center = [x, y]

bird_group = pg.sprite.Group()
player = Bird(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2)
bird_group.add(player)

ground_scroll = 0
scroll_speed = 4
is_active = True
while is_active:
    clock.tick(FPS)

screen.blit(bg, (0, 0))
    bird_group.draw(screen)
    screen.blit(ground_img, (ground_scroll, 512))
    ground_scroll -= scroll_speed
    if abs(ground_scroll) > 35:
        ground_scroll = 0

for event in pg.event.get():
        if event.type == pg.QUIT:
            is_active = False

pg.display.update()
pg.quit()