Used CSS animation to highlight custom-field-container when created or changed

_sass/communityrule.scss

@@ -123,6 +123,13 @@
     padding-bottom: .5em;
 }
 
+#custom-field-container {
+    animation: blinker 1s linear 1;
+}
+@keyframes blinker {
+    from {background-color: lightgray;}
+    to {background-color: white;}
+}
 .field-controls {
     float: right;
     font-size: .7em;