--- a/CookBook/document/root.tex	Thu Jan 15 13:42:28 2009 +0000
+++ b/CookBook/document/root.tex	Fri Jan 16 14:57:36 2009 +0000
@@ -60,7 +60,7 @@
 % this is to draw a gray box around code
 \makeatletter\newenvironment{graybox}{%
   \begin{lrbox}{\@tempboxa}\begin{minipage}{0.985\textwidth}}{\end{minipage}\end{lrbox}%
-  \colorbox{gray!10}{\usebox{\@tempboxa}}
+  \colorbox{gray!20}{\usebox{\@tempboxa}}
 }\makeatother
 
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