diff --git a/bug.py b/bug.py
index 5680c16..a1dd0ea 100644
--- a/bug.py
+++ b/bug.py
@@ -2,6 +2,9 @@
 import turtle
 pen= turtle.Pen()
 screen=turtle.Screen()
+screen.bgcolor("red")
+pen.pencolor("blue")
+pen.pensize(5)
 size=screen.textinput("提示","你想要多大的魔法阵呀?")
 a=int(size)
 pen.circle(a)