nytprofhtml CSS: Play nicer with themes

Fixes problems with dark desktop themes (light font on light background, barely
links).

Just sets the colors on the BODY element and trusts in inheritance.

Also, set the color of unvisited links - which will propbably be set by the
(dark) theme, too.

bin/nytprofhtml

@@ -1778,10 +1778,11 @@ sub get_css {
  */
 
 /* Note: default values use the color-safe web palette. */
+a { color: blue; }
 a:visited { color: #6d00E6; }
 a:hover { color: red; }
 
-body { font-family: sans-serif; margin: 0px; }
+body { font-family: sans-serif; margin: 0px; background-color: white; color:#222; }
 .body_content { margin: 8px; }
 
 .header { font-family: sans-serif; padding-left: 0.5em; padding-right: 0.5em; }