Create stylized PDF output. The first STYLE option specifies that the background color of the cell containing the value for N be changed to blue and that the font style be changed to italic. The second STYLE option specifies that the background color of the observation column, the observation header, and the other variable's headers be changed to grey.

proc print data=exprev split='*' n obs='Observation*Number*==========='
     style(n) = {fontstyle=italic backgrouncolor= blue}
     style(header obs obsheader) = {backgrouncolor=yellow color=blue};