Create stylized HTML output. The first STYLE option specifies that the column headings be written in white italic font. The second STYLE option specifies that ODS change the color of the background of the observations column to red. The BLANKLINE option specifies to add a blank line between each observation and use a background color of red.

proc print data=exprev double
    style(header) = {fontstyle=italic color= white}
    style(obs) = {backgroundcolor=red}
    blankline=(count=1 style={backgroundcolor=red});