title: Pygame window displays blank black screen
body: <p>Here is my code, please keep in mind that I picked up python a couple of days ago so my code may be incorrectly made, ect. I am trying to make a window that will display some text (beta) and will display two small rectangles that I want to make into buttons. </p>
  
  <pre><code>import sys
  import pygame
  from pygame.locals import *
  pygame.init()
  
  size = width, height = 720, 480
  speed = [2, 2]
  black = (0,0,0)
  blue = (0,0,255)
  green = (0,255,0)
  red = (255,0,0)
  
  screen = pygame.display.set_mode(size)
  screen.fill((blue))
  
  pygame.display.set_caption("BETA::00.0.1")
  
  clock = pygame.time.Clock()
  
  def game_intro():
  
    intro = True
  
    while intro:
       for event in pygame.event.get():
           print(event)
           if event.type == pygame.QUIT:
               pygame.quit()
               quit()
  
      gameDisplay.fill(blue)
      largeText = pygame.font.Font('freesansbold.ttf',115)
      TextSurf, TextRect = text_objects("BETA", largeText)
      TextRect.center = ((display_width/2),(display_height/2))
      gameDisplay.blit(TextSurf, TextRect)
  
      pygame.draw.rect(gameDisplay, green,(150,450,100,50))
      pygame.draw.rect(gameDisplay, red,(550,450,100,50))
  
      pygame.display.flip(screen)
      pygame.display.update(screen)
      clock.tick(15)
  </code></pre>