Change link colours and styles in a certain css?

I am creating my first webpage for myself, i have created multiple webpages before but i want this to be professional. I have a professional look and feel but when i add links to the text navigation bar which is in a css. I Want the links only in this css to be black, no underline and no other colours when active, rollover, or visited. But other links on my page i want to remain blue. Is there a code i can enter under this css to give this effect? Thanks in advance.