If you are getting ads in the bottom right corner of your screen, but they aren't hard to close, just anoying, then you might be a victim of browser notification spam. Here's what they look like:

If you'll look closely, it tells you where these ads are coming from.

Here's how to get rid of them IF YOU ARE USING CHROME:

First, click the MENU button in chrome (which is the 3 vertical dots in the top-right), then click SETTINGS

Then, click PRIVACY AND SECURITY, and click SITE SETTINGS

Then, scroll down some more and click NOTIFICATIONS

Now you will see a list of websites that you (or somebody that was using your computer) has agreed to allow this nonsense from. Click the 3 vertical dots to the right of it, and click BLOCK.

Repeat for every website you don't recognize. There might be sites you actually want notifications from, such as google.com if you want this type of notification from gmail when you recieve new email.

Consider blocking future notification requests by default:

Once you get everything you want blocked, just close the tab.

At this point, you might be wondering how these sites got in this list. Here's what it looks like when a site is asking you for this permission:

Keep your eyes peeled for this in the future!