Adding a drop-shadow to white text

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I have tried to follow several tutorials about modifying the typography.css file, etc., but I'm having no luck. :(

I'd like to use this "Readable White Text" style with Concrete5, but I am at a loss on how to do so:http://www.w3.org/Style/Examples/007/text-shadow.en.html#white...

Can anyone walk me through adding a custom style?

Thank you SO much!!!