Go learn the shit! Cuz chances are, even though kurt's example will throw a black solid border up, chances are you may not even want a black border, then you are going to want some padding so the border is visable and hell you may not want a solid border. Hit some good sites and learn the shit!!!
Download a pre-made CSS template and start dicking around with stuff, change this or that by a few pixles and what not and keep refering back to a good referance like W3schools and in no time you will be throwin down CSS with your eyes closed.