Make the redundent portion of the lower navigation area disappear from the
printed version for browsers that support "@media print" in CSS.
diff --git a/Doc/html/style.css b/Doc/html/style.css
index e0cb736..bd79427 100644
--- a/Doc/html/style.css
+++ b/Doc/html/style.css
@@ -140,3 +140,11 @@
  * the top of modules.
  */
 .availability .platform { font-weight: bold; }
+
+
+/*
+ * Some specialization for printed output.
+ */
+@media print {
+  #bottom-navigation-panel { display: none; }
+  }