Make the <body> tag match those of the generated HTML; rely on the style
sheet instead of encoding anything there.
diff --git a/Doc/html/index.html.in b/Doc/html/index.html.in
index 184af51..3ba73c8 100644
--- a/Doc/html/index.html.in
+++ b/Doc/html/index.html.in
@@ -7,7 +7,7 @@
       ul { margin-left: 1em; padding: 0pt; border: 0pt; }
     </style>
   </head>
-  <body bgcolor="#ffffff">
+  <body>
 	<div class="navigation">
 	<table align="center" width="100%" cellpadding="0" cellspacing="2">
 	<tr>