---

while game_over != True:
    ball.rect.x += speed_x
    ball.rect.y += speed_y
    if ball.colliderect(platform.rect):
        speed_y *= -1
    if ball.rect.y < 0:
        speed_y *= -1
    if ball.rect.x > 450 or ball.rect.x < 0:
        speed_x *= -1