refs #4053 improved style of feedback success message

plugins/Feedback/stylesheets/feedback.less

@@ -33,9 +33,11 @@
 }
 
 #feedback-success {
-    color: #38D73B;
+    color: #468847;
+    background-color: #dff0d8;
     text-align: center;
-    border: 2px solid #38D73B;
+    border: 1px solid #d6e9c6;
+    border-radius: 5px;
     margin: 10px;
     padding: 10px;
 }