Introducing CSS to an existing site that doesn't have it.

Newbie question

[jmf3001]

Are there any problems to watch out for if I add CSS to an existing site that doesn't have CSS?
I've just upgraded from DW 3 to MX, where CSS is the default when building a page. Somewhere in one of the tutorials, I saw something that warned that CSS is the default with MX and that you need to turn it off if you don't want it.
My question is, is there any reason I can't go ahead and a new CSS page that will be part of this otherwise static site?
thanks.
John

[ronin]

Pages which use CSS are also static.

There's nothing wrong with having a site where some pages use one CSS file, some use another and some don't use CSS at all.

In the long run however, site maintenance is made considerably easier by using either a global or several sub-global CSS stylesheets... since this means you can modify the look of tens or hundreds of pages simply by editing a single file.

Once you get the hang of CSS on the new pages you're writing, you'll be able to apply it to your older pages which don't currently use CSS for styling and make those pages a lot more streamlined.