The following article shows you how you can cancel push notifications.
First option:
You can either click on the Icon, usually in the left bottom corner, to display the individual settings menu of the website you want to cancel your subscription.
Second option:
You can cancel your subscription via your browser's settings.
Click the Chrome menu on the browser toolbar
On your computer, open Chrome.
At the top right, click More (three dots)
Click More tools > Clear browsing data.
At the top, choose a time range. To delete everything, select All time.
Next to "Cookies and other site data" and "Cached images and files," check the boxes.
Click Clear data.
In Chrome, you also have the possibility to do it like that:
Select the lock icon next to a website name in the Address bar, then select Cookies. In the Cookies in use dialogue box, expand a site name, choose a cookie, then select Remove. Moreover, you can also change or reset site permissions by clicking on the lock icon.