Font size in back end

Hi,
I’m trying to change the font size in the article editor view (I mean only back end) following what read elsewhere in this forum and, basically, this tutorial:
http://www.joomlacontenteditor.net/support/tutorials/editor/item/create-a-custom-editor-stylesheet?category_id=53

Anyway there are some things I don’t understand:

why the article says:
Go to the front page of your site and view the source code. Make a note of the css files loaded by your template
since we’re referring to the back end view, why importing CSS files loaded in the front view?
I’ve tried to import all front view CSS files; font size changes, but doing this some rules seems to be losen; for example, list styles change, and there’s no marker in each item of the list
if I only specify the font size (as a rule for the body) in editor.css, without importing nothing (no template or Joomla CSS files imported in editor.css), apparently everything seems to work fine.
Do I risk to loose important rules in the way the article is formatted by JCE, doing in this way?
What I risk to loose by not importing others CSS files?

I hope my english is understandable, thanks very much for any answer

sceptik, I’ve moved your thread over to the Content Management forum as your question isn’t related to graphics but rather to Joomla.

Hi sceptik,
I haven’t done anything with Joomla for about 4 or 5 years so I don’t know it at all however, I would use FireFox and FireBug (or Chrome and Firebug lite) to analyze the page to see which css file and which part of the css file affect the font size. Then you can simply override the setting with a larger font size.