As far as I know, that text-shadow only works in Safari, but I could be wrong, Firefox too maybe, but definitely not Satan's browser (IE)

anything with a # in front of it, and outside the curly brackets signifies a CSS ID. Inside the curley brackets signifies, usually, a hex color code.

. refers to a CSS CLASS, and is used instead of an ID when the item appears more than once on the same page.

I'm sure the above is confusing, but some things cannot be taught in 3 paragraphs...