Index: acidfree.css
===================================================================
--- acidfree.css	(revision 70)
+++ acidfree.css	(working copy)
@@ -95,8 +95,7 @@
 
 div.block-cell {
     float: right;
-    margin-left: 5px;
-    margin-right: 5px;
+    margin: auto;
     clear: none;
     background: transparent;
     padding: 5px 0px 10px 0px;