Cant override sky css

Hi,

I have read carefully all the instructions for sub-theming and it seems that I just cannot override Sky css. I have kept the footheme name so it is one less source of mistake.

In the .info file, what is the correct syntaxe for:

stylesheets[all][] = color/colors.css
stylesheets[all][] = css/footheme.css

Is it: «stylesheets[all][] = colors.css»? & «stylesheets[all][] = footheme.css»?

Now, it is written (in the readme?):
«In footheme_preprocess_html() you will find some stuff about responsive stylesheets and IE conditional stylesheets - follow those instructions carefully - they are easy and involve renaming some CSS files to match your theme name.»

This is where I probably missed something: «follow those instructions carefully». I haven't seen any instruction beside erasing a few lines. «renaming some CSS files»: I did not see anything about renaming CSS files.

Looking for some light...

Thanks.