Yes, by embedding raw HTML:
<html>
<style type="text/css">
#tiddlerMyTiddler { ... }
</style>
</html>
There's also a page on the community wiki:
http://www.tiddlywiki.org/wiki/Tiddler-Specific_Styles
That also explains how to access tiddlers whose title contains spaces.
-- F.
Works fine for me:
http://fnd.lewcid.org/tmp/tiddlerCSS.html
> I kind of remember that someone once said <style type="text/css">
> doesn't work in TiddlyWiki only <script> does.
It's the other way around; SCRIPT tags don't work (unless you're using
Eric's InlineJavaScriptPlugin, of course), but STYLE tags are just fine.
-- F.