Since I didn't like being forced to use a background color .. white background on a white field is okay if the reader is using a white background .. but looks harsh on a black background .. I modified it slightly this way:
; this one will give you a choice for a colored background, default is white
; set %color.font $+ %cf.font $+ , $+ %cf.bkgrd
; this one removes the colored background
set %color.font $+ %cf.font