We have a method of inflating ePubs and then driving the content in the /ops/xhtml directory of the book to the web through an iFrame. another model grabs the toc.ncx file, and builds at TOC navigation list to pass to the view/sidebar. There are 20 different reason why this is not working well and is a "bad practice" and were going to re-model the delivery/views soon.
Meanwhile I would like help just to get the side bar (which is now "sticky" to the top of the browser window) to scroll on overflow, and for the bottom of the TOC to end above the footer. I tried adding "overflow: scroll" to the inner most container and also to the parent(s) in the DOM, but "no joy" So, this view is deprecated but in the meantime I would like to have this working until we get the new model/views/delivery mechanism built.