The page styles "empty", "plain", "headings" and "myheadings" work like in
LATEX's article style. There is also a page style "align" which puts "+"
signs in the corners, like in .See question
in Section for suggestions on defining new page styles. You can
change the size of the fonts used in headers and footers in the slides format
by setting the commands
to the desired size, using "" (but any explicit font declarations
in a page style override these commands). The default definition of these
commands is "".