Page load effect

Hello,

I am working on a project and I am looking to obtain a similar page load effect as this website: https://web.archive.org/web/20170624...sors.com/about

How it works:
If you scroll to the bottom of the page and click on the footer it will then expand to a new page. Does anyone know of a plugin to accomplish this, or has anyone done anything like this before?

Thanks in advance!