The printer stylesheet is identical to the screen stylesheet, with the only difference consisting in making font colors black, and thus more easily readable on paper. One hack was needed to alleviate an IE6 margin bug (When we increase the page container width by 1px, IE renders the page correctly in printing mode, otherwise the right two columns will not fit, and therefore jump down and distort the entire page layout.) The printer stylesheet is automatically activated by the command "Print Preview" or "Print" in the browser.