diff --git a/doc/html/reference.css b/doc/html/reference.css
new file mode 100644
index 0000000..6826962
--- /dev/null
+++ b/doc/html/reference.css
@@ -0,0 +1,11 @@
+/*============================================================================
+    Copyright 2003-2004 Douglas Gregor
+    Distributed under the Boost Software License, Version 1.0. (See accompany-
+    ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+============================================================================*/
+
+PRE.synopsis { 
+  background-color: #e0ffff;
+  border: thin solid blue;
+  padding: 1em
+}
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