diff --git a/Viewer/css/layout.less b/Viewer/css/layout.less
index f629f818..2199c93c 100755
--- a/Viewer/css/layout.less
+++ b/Viewer/css/layout.less
@@ -340,6 +340,9 @@ button:hover {
 	transition : all 0.1s ease;
 }
 .buttons:hover .button {
+	opacity: 0.7;
+}
+.buttons .button:hover {
 	opacity: 1;
 }
 .buttons .button.visible {