Hmmm, I just downloaded the Pier 1.2 one-click and it does work for me. Had to click apply and F5 a couple of times before it took. 
I am using IE8.
I am forwarding this to the Pier list at smallwiki@iam.unibe.ch in case someone more knowledgeable has an idea what your problem might be.
 
John
 
On Thu, Sep 9, 2010 at 10:25 AM, Cyrille Delaunay <cy.delaunay@gmail.com> wrote:
Just try, and it does not change. Whatever I type in the editor (even non css code), it apply the default css.


2010/9/9 John McKeon <p3anoman@gmail.com>
Did you try pressing F5/Refresh to get the CSS to reload?

 
On Thu, Sep 9, 2010 at 9:56 AM, Cyrille Delaunay <cy.delaunay@gmail.com> wrote:
So here is wht I tried:
When i'm on a page, I click on the command 'edit design'. It open an editor on the default css (for me, using the pier on click image, it seems to be 'eventCss', am I right?).
So here I guess I'm able to edit the default css. But when I change some parameters in the css code, it doesn't modify anything on my web page. 
What is more strange, is that if I delete all the text from the editor, this time the change is taken into account, and my web page is rendered without any Css style. If I tried just to write  a comment (like /*comment*/ ) in the editor, then the default design re-appear.
There is surely something I missed ? :)

2010/9/9 John McKeon <p3anoman@gmail.com>

Hello Cyrille,
Use the Edit Settings command to set the stylesheet of a pier structure.
 
Navigate to the current default stylesheet of your pier (mine is under /System/Compoents) and then use the Copy command to make a duplicate with a different name.
 
Point the blog's stylesheet to the new stylesheet and edit away.
 
This also applies to changing the environment of a structure.
 
Hope this helps
John
 
 
On Thu, Sep 9, 2010 at 4:45 AM, Cyrille Delaunay <cy.delaunay@gmail.com> wrote:
Hello,
I'm currently playing a bit with pier and have some difficulties about setting my own css style. 
I would like to know if it is possible in pier to say 'use this css file for the whole blog'? 
I would like to retrieve the default css, base my new css file on top of this one (to know the css classes, id used), and apply it.

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