Three type of on page message styles

[frjo]

1. Old style on page messages, this is what you get when using e.g messages.success():

2. Add PROJECT_ACTION_MESSAGE_TAG to e.g messages.success() and you get:

3. Adding showMessage to a HX-Trigger you get this style that also clears automatically after a short while:

Can we merge style 1 and 2 so we have only to types? Making them look a bit more alike would be good in any case. Consistent colours for error/info/success.