So a few versions of OSX back the notification centre started allowing 3rd party notifications. So now lots of websites have a popup that says “get the latest” and if you say yes they will forever send you push notifications on your desktop. I’ve managed to stay out of this trap for some time but the other day I accidentally, absentmindedly, said opted in. How can I get rid of these? I go into system preferences, notification centre, but I can’t how to delete this website as a source. Anybody know how to delete notifications from a website?
Can you post a screenshot of which exact area your notification is showing up in? 
Edit:
Open Safari › Preferences › Notifications There you can remove objects permanently.
Thanks that seems to have done the trick.