diff --git a/snake.py b/snake.py
index dd00eb4..4174835 100644
--- a/snake.py
+++ b/snake.py
@@ -3,6 +3,7 @@ from pygame import locals
 # 初始化pygame，为使用pygame做准备
 pygame.init()
 
+backgro`
 # 创建一个窗口
 scrteen=pygame.display.set_mode((660,480))
 while True: