diff --git a/src/public/app/widgets/note_icon.js b/src/public/app/widgets/note_icon.js
index dd04d0601..8d101cb84 100644
--- a/src/public/app/widgets/note_icon.js
+++ b/src/public/app/widgets/note_icon.js
@@ -12,7 +12,7 @@ const TPL = `
     
     .note-icon-container button.note-icon {
         font-size: 180%;
-        background: transparent;
+        background-color: transparent;
         border: 1px solid transparent;
         cursor: pointer;
         padding: 6px;