fix cascading error

--HG--
extra : rebase_source : ea6e1127d81f218a89047cb123bd34682ee86c15

Author: fantasai

default.css

@@ -567,7 +567,8 @@ table.features td {
 .data td, .data th,
 .proptable td, .proptable th {
 	padding: 0.5em;
-	border: 1px silver none;
+	border-width: 1px;
+	border-color: silver;
 	border-top-style: solid;
 }