In the video in the first post above, at 1:33, he says "in the back end area" and then brings up another window. Where is this? I can't seem to find where the list of the directories and files are that he's showing in that screen.

Thank you!

I'm assuming that is the folder structure to where the Joomlapolis templates should be once everything is installed... I'm not finding anything close to that path in my installation. I've looked in the components, modules and plugins directories and the main templates directory. Has the path structure changed since the video was made?

Thanks!

OK. This is a solution. But a very extensive, which is equivalent to a new template.
Another, easier, solution I would prefer.

Why can not override.css by developers with in the default template?
Set there as the last CSS, so that it is loaded last, and possibly an EDIT-form in the admin area. (also there is the possibility of CSS "important!")
Thus, the style can be overridden.

Then I want to address the problem with the black standard avatars here in a moment. These are PNG black with transparency. In a black Joomla template you can not see it. For now specially create a new template? Without transparency (white) and a border the matter would be solved easily.

New templates and overrides are always worse than the originals because they are an update lock.

EDIT:
QUESTION: Is it a OVERRIDE or a new Template? Override the example-Template the default-Template?