Config overridden highliter

Psss.. hey, man.. Wanna highlight some overridden settings?

As you might already know Drupal 8 has a different system of overriding settings comparing to Drupal 7. More about that is accessible here. So it is not always obvious that your settings are overridden in settings.php and you kind of trying to change the settings via admin page and still see the same result as it was! So WTF?