How do I adjust the width of the left, right, and content panes?  Can these adjustments be made to individual pages or can they only be applied to all pages in the portal? 

RE: HowTo Set the Width of the .RightPane (fixed width)
DNN 4.0.3

I'm ultra new to DNN and CSS too.  I want to fix the width of a portal's .RightPane - so inside a portal logged in as Admin - I select Site Settings > Stylesheet Editor and I change the following from:

.RightPane {
}

... to:

.RightPane {
 width: 500px;
 background-color: transparent;
 padding-left: 6px;
 padding-right: 4px;
 padding-top: 6px;
}

(a snippet of code I found in C:\DotNetNuke\Portals\_default\Skins\DNN-BlueDNN\skin.css).  I've exaggerated the desired width to 500px, just so I could see a 'big' change.  After clicking "Save Style Sheet" then "Update", I "Preview", but there's no change in Right Pane width.  Shouldn't the Site Stylesheet Editor be the place I could make that .RightPane width change affect the whole portal?  I must be missing something... obiviously?

PS: C:\DotNetNuke\Portals\0\portal.css contains the changes I made in Stylesheet Editor...

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I'm still a newbie too, so I've not tried doing it that way.  I've had the need to make many changes to a skin I found for my site, so I've worked directly in the .CSS file then re-packaged it and uploaded it to my site.