Rebalance: Fix an issue with captioned images with aligncenter class not being centred. Fixes #255.

rebalance/style.css

@@ -2639,7 +2639,7 @@ object {
 	text-align: center;
 }
 
-.post .wp-caption.aligncenter {
+.wp-caption.aligncenter {
 	margin: 0 auto 1.5em;
 }