import pygame
import sys
pygame.init()

display = pygame.display.set_mode((300, 300))
display.fill((255,255,255))

pygame.draw.rect(display, (0, 0, 255),(40, 80, 200, 80), width=0, border_radius=20)
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
    pygame.display.update()