stupid CSS question

I'm trying to teach myself a little CSS while redesigning one of my
websites.

If I am applying styles internally (I think that is the term my link colors
are set within the style tags)....how can I change the color of the links in
a different place on the page (locally?).

For instance if I have the links in white on the sidebar, how can I make the
links blue in another part of the page.  Can I put it in the a href tag
somehow.  Nothing I've tried is working.  I don't know if any of this makes
sense but it's been a long day.

Karin

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