[support] Theme for printing

Hi I am using Mayo theme with an added css for overriding some positions of blocks. I need to create a css for printing a calendar and news items without the Mayo header or footer and only in grey scale. I am comfortable with css and the .info file but have no idea how to call a dedicated print.css when a user wants to print calendar or news item on plain white background. Can someone please advise me. thanks in advance Roger