Does the Section ID change on a page you are creating when you take that page public?

Site URL: http://www.beyondedgenetworks.com

How do you apply CSS only to a non-linked or non-public page?  We are currently updating a few pages on our existing website that has CSS applied most pages at some level. Better put, can you add CSS to these new pages when they are not linked to the public portion of the site?

Any of the "block" ID's will stay the same, unless you move or delete that item.

I haven't had an issue with them changing when the site goes live.

The "yui" ones change.