It is a good idea to add a comment to the top of the style sheet:
/* /file/path/HtmlCSS.css 7th June 2007 AdFos
7 Jun 2007 AdFos Changed size from 11 to 15 of heading in header id
1 Jan 2006 AdFos Original version
*/
This shows developers that users are seeing the latest version, they are not caching an older version, and
changes made can be recorded and reversed if they mess things up.
Also: If you save your css as a lotus notes page, also make sure you set the Content type to Other: text/css