diff --git a/SICP/slide00.tm b/SICP/slide00.tm
index b6cd9da..61eacbd 100644
--- a/SICP/slide00.tm
+++ b/SICP/slide00.tm
@@ -1,6 +1,6 @@
 <TeXmacs|2.1.2>
 
-<style|<tuple|beamer|no-page-numbers|chinese|blackboard>>
+<style|<tuple|beamer|no-page-numbers|chinese>>
 
 <\body>
   <screens|<\shown>