Create a sticky menu component

[padms]

We would like to create a sticky menu that follows a user as the scroll down a page. This would be used for the Annual report landing page in the first iteration to allow the main AP PDF to be accessed by user.

The component should be visible as user scrolls down the page
The component should allow editor to add a title
The component should have an option to add an anchor link to jump down to a given point on the page
The component should allow editor to add a download
Options for colour background: White + light green as per sketch.
Use new design for Download CTA inc new Icon for PDF
Should the component not feature on mobile?

Inspiration:
https://www.apple.com/environment/

Challenges:
How does it interact with the main menu? Apple example works well when user scrolls back up.
Should we replicate the shadow of the main menu on the sticky menu?