Limiting available CSS styles

["dewebmaster" <webforumsuser@xxxxxxxxxxxxxx>]

We're testing Contribute as a possible solution for editing 
non-database-managed content for a ASP.NET 2.0 site that uses .NET Master 
Pages.  We'd like to restrict users' ability to apply styling to content that 
they enter by only allowing the use of standard heading tags (h1, h2, etc) and 
specific CSS styles for color.  I've tried to do this by going to [b]Edit Role 
Settings[/b], selecting [b]Show only CSS styles in this CSS File[/b], and 
selecting a CSS file that's located within the Web site I'm connecting to.  
(The role I'm editing is Administrator, which is the role I'm assigned to).  
For some reason this is not working (the styles in the CSS document do not show 
up in Contribute editor's drop-down list).  Does anyone have a suggestion for 
fixing this?