Override style sheet change link colour

Very basic question - how do you change the colour of one specific link on a page, when the page has a predifined link style?

i.e. all links on page are white (as determined in page style) how do I turn one specific link blue?

Thank you in advance.

 

Either add a class/id to the link and style that, or use inline CSS on that specific link.

Preferably the first option, since it's best to keep your styling separate from your markup.