Need to show red alert on custom notification icon in service portal

[Community Alums]

I have created a custom notification icon inside header menu in service portal. Now i want to show red alert on notification icon whenever user receive any notifications. How to achieve this?

[SumanthDosapati]

@Community Alums 

What notifications do you mean? When a user receives email from ServiceNow?

[Community Alums]

Yes, whenever user receives any new emails then a red dot should be visible on the notification icon, so that the user will understand that the new notification/email is received.

[Ankur Bawiskar]

@Community Alums 

I don't think you can add any styling to it

share what did you configure so far, share screenshots.

If my response helped please mark it correct and close the thread so that it benefits future readers.

[Community Alums]

This is the custom notification icon which I have added.

I have used menu item to create above notification icon.

When I click on this notification icon then it routes us to a page where I'm fetching the top 10 emails of current logged in user.
Now what I want is, whenever a user receives any new emails, then the notification icon should show a red dot so that the user will understand that new notification is received. How to achieve this?