diff --git a/button.py b/button.py
index dbaef43..da827c6 100644
--- a/button.py
+++ b/button.py
@@ -13,4 +13,9 @@ class play_Button():
         self.rect = pygame.Rect(540, 300, self.width, self.height)
         # self.rect.center = self.screen_rect.center
         # 按钮的标签只需创建一次
-        self.prep_msg(msg)
\ No newline at end of file
+        self.prep_msg(msg)
+    def prep_msg(self, msg):
+        """将msg渲染为图像，并使其在按钮上居中"""
+        self.msg_image = self.font.render(msg, True, self.text_color, self.button_color)
+        self.msg_image_rect = self.msg_image.get_rect()
+        self.msg_image_rect.center = self.rect.center
\ No newline at end of file