Angular Sticky Sidebar

I am strugling to have a sticky sidebar that stops scrolling when its bottom edge is reached, I would like to have similar effect the second example “Scrollable Sticky Element” on this page:

When the user reaches to the bottom of the sidebar, the bottom edge should stay stuck to the bottom of the browser window. However I want to archive this without JQuery (sticky-sidebar uses jQuery). Using just Angular.

Source: New feed
Source Url Angular Sticky Sidebar