I have a complex table that has three heading rows with some cells merged in the heading to go over certain columns (see picture) and the table is very long. The sticky headers does not seem to work (it is embedded in a page that goes on for many pages when printed). I cannot get the sticky header to work. I would also like to make heavier weights to the borders of some columns to set it off. What am I doing wrong? Also, how do I add colors that are not shown on the color icon - I would like varying shades of gray and blue rather than green.