How to create a notification bar at bottom of page?
<p><a href="https://i.stack.imgur.com/VbyDy.png" rel="nofollow">I want something like this at the bottom of the page</a></p>

<p><a href="https://i.stack.imgur.com/VbyDy.png" rel="nofollow"><img src="https://i.stack.imgur.com/VbyDy.png" alt="enter image description here"></a></p>

<p>Just wondering how to create a notification bar at the bottom of the page to push certain types of things to visitors.  </p>