diff --git a/Viewer/css/layout.less b/Viewer/css/layout.less
index 2199c93c..237c6c8b 100755
--- a/Viewer/css/layout.less
+++ b/Viewer/css/layout.less
@@ -340,7 +340,7 @@ button:hover {
 	transition : all 0.1s ease;
 }
 .buttons:hover .button {
-	opacity: 0.7;
+	opacity: 0.5;
 }
 .buttons .button:hover {
 	opacity: 1;