How to set the CSS styles for a message set with $this->flashSession->success as it showed only how to do it for Implicit Flush flashes in the docs. :)
$di->set('flashSession', function(){ $flash = new \Phalcon\Flash\Session(array( 'error' => 'alert alert-danger', 'success' => 'alert alert-success', 'notice' => 'alert alert-info', )); return $flash; });