What site was it? I don't know why, but your description makes me think of
http://www.csszengarden.com/
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But what is CSS exactly and is there an advantage to using it?
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I'm not an expert at this, but it stands for Cascading Style Sheets. Actually HD itself makes use of CSS.
From
http://www.w3.org/Style/CSS/ :
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Cascading Style Sheets (CSS) is a simple mechanism for adding style (e.g. fonts, colors, spacing) to Web documents.
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As for "simple", that's a relative thing. It should be easy to learn if you know HTML.
One advantage would be ease of design change, as you can see over at the site mentioned above, but there's a whole debate on whether using CSS (divs) is better than using tables. It's pretty much like the Windows vs Linux debate.
A web designer should be able to tell us more about the advantages of CSS.