Dismiss mac notifications

Currently I have a banner notification saying "Upgrade to macOS Mojave" but I don't want to upgrade.

I have three options:

• click "Install" - and open the install program
• click Details - and open the details
• click the banner - and open the details

All I want to do is dismiss the notification. I don't want to waste my time opening other stuff.

How can I just dismiss the notification ???