How to create a cookies banner....

[letsgofishing]

Hi all,
OK I've created a new layer at the top of the p&l gallery with the elements on it - see below.

The links to the privacy and cookies policies will go to one new page on the site - so far easy!
Iv'e made this panel a web animation that fades in and checked the "once only" button, but it's a single scrolling page website and I can't get the panel to disappear once I scroll past it ( or select a new heading from the Menu) and then go back to top of page.
Also how do I make this layer disappear when a user clicks the OK button? Should I put the button on a separate layer?....
Thanks in advance guys...