Collapsible side menu, with footer

I followed this discussion and downloaded the project which I like and think I can use.
However, I would like to add a footer similar to this article: https://docs.wappler.io/t/push-footer-to-bottom-of-viewport/12929

I followed the steps outlined there, but the footer does not move to the bottom. I think there might be some conflict of classes, maybe.
Attached is my modified version of the sidebar-template with my attempt to add the footer. If someone could take a look and see what it’s missing, that would be great!
Thanks, Dan
sidebar-template.zip (336.1 KB)