Request a content of any link on the page or on the site after the cache has been expired.
The message "Please login first" will be a different color than green.
The message is green, a positive and successful action.
J3.9.4
code to be changed
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Yellow is my choice :) And it fits to the warning definition, too.
| Status | New | ⇒ | Discussion | 
I believe it is in Global configuration > System > Cache settings > Cache time
Activate "Logged-in Users" module for the Administrator interface and logout the user there.
I don't think that the reconstruction of the effect is so important. The message is of type message (green) by default, because no type is defined https://docs.joomla.org/Display_error_messages_and_notices. So, I argue that "a message requiring a user to log in first" should by of type notice or warning (preferred), wherever it occurs.
Could you do screenshot please.
Screenshot for How do I
Activate "Logged-in Users" module for the Administrator interface and logout the user there.
| Status | Discussion | ⇒ | Closed | 
| Closed_Date | 0000-00-00 00:00:00 | ⇒ | 2019-03-16 05:27:53 | 
| Closed_By | ⇒ | franz-wohlkoenig | 
| Closed_By | franz-wohlkoenig | ⇒ | joomla-cms-bot | 
Set to "closed" on behalf of @franz-wohlkoenig by The JTracker Application at issues.joomla.org/joomla-cms/24177
Working on it
@kofaysi what should be the color according to you.