Don't use green for message because it may be an error

supervisor/ui/stylesheets/supervisor.css

@@ -101,7 +101,7 @@ html, body {
   padding: 5px 10px;
   border: 1px solid #919191;
   background-color: #FBFBFB;
-  color: #259217;
+  color: #000000;
 }
 
 #buttons {