I have to credit my colleague and friend Krishna Lair for this (and many other cool finds of course). Notyf is a really quick and simple way to have lovely success, error and general notifications.

Designed by Carlos Roso, you can use them straight out of the box or customise your own. We've found them particularly useful when dealing with form submissions, creating that little bit of smooth, modern and unobtrusive feedback to the user.

You can view the Notyf docs on Github here.