Add pop-up notice in HTML block

[Peteh2]

Thanks to all,
I have done it.
Get the how to:

How to show notification message as popup on webpages

Hello Developers, I am using Concrete5 version 8.5.9 and PHP version 7.4 . I am excited to figure out how to display notification message on my webpages. The notification message popup shows on the top right corner of my webpages as a alert message and it’s closed with a push button of close. I have read the documentation, provided by you but I am confused, where I can add those codes as given in the Example. I am new with Concrete5, so please clarify in simple words. Thanks

Thanks