Slightly higher z-index for updates-button

src/app.css

@@ -442,7 +442,7 @@ a.mention span {
 }
 .updates-button {
   position: absolute;
-  z-index: 1;
+  z-index: 2;
   animation: fade-from-top 2s ease-out;
   left: 50%;
   margin-top: 8px;