Improving Scrollabilty for Page-End Editing

[GuoDCZ]

Some users prefer to position the cursor at the center of the page, but this is not possible when the content fills at least a full page and the user is editing the last line of code. While a rough solution can be simply adding padding-bottom: 100%; to #main to make the page more scrollable, we may expect a preciser one by referring to the location of the last item.