Ask HN: Any recommendations for a “Your browser is not supported” banner?

Now that Microsoft has released Edge on Windows 7 and 8, and recent versions of Edge are using Chromium, I'm finally going to drop support for IE 11 and Edge < 18. Ideally I'd like to show a banner that tells the user that their browser is unsupported, and wondering if there are any drop-in solutions for this. Ideally it would be lightweight, responsive, allow you to specify what versions of each browser you don't support, and link to a professional looking website to update the user's browser. Any recommendations?