diff --git a/less/core.less b/less/core.less
index 3265e9c..9d2e1ab 100644
--- a/less/core.less
+++ b/less/core.less
@@ -1515,6 +1515,11 @@ div.row {
 		margin-left: 0;
 		margin-top: 0;
 	}
+	article {
+		.hidden {
+			.opacity(1);
+		}
+	}
 }
 
 @media print {