I understand that:

there is a JIRA somewhere on AppFormer to move the "Notifications" to follow Pattern Fly design (which is used by, for example, EAP/WildFly too).

but

the green ones however are Stunner.. and IDK if there's one there..

as demonstrated here:

Personally I become quite fast in clicking the X on those green popups, but it is becoming a bit annoying exercise can you kindly consider if there is a better UX/implementation way, please?