import pygame

WIDTH = 500
HEIGHT = 500
BLACK = (0, 0, 0)
pygame.init()

sc = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("")
clock = pygame.time.Clock()
pygame.time.set_timer(pygame.USEREVENT, 100)
running = True
r = 255
g = 255
b = 255
while running:
    sc.fill(BLACK)
    for event in pygame.event.get():

        if event.type == pygame.QUIT:
            running = False
        if event.type == pygame.USEREVENT:
            if r > 0:
             r = r - 5
             g = g - 5
             b = b - 5
            
               
             

    
    pygame.draw.circle(sc,(r,g,b), (200, 250), 200)
    pygame.display.flip()

pygame.quit()