how can I print a web page with all its css style attached to the page?

I want to add a print button to enable users to print my web page. However when I print all the css styles are lost. It seems the printer only keeps the basic html elements. If I also want to print out the page exactly as it looks like in a browser, what should I do? I mean if I use a color printer it will print a colorful page with css styles on it. When I use a black and white printer it should print light colors as white and dark colors as grey or black.