see forum post

http://forum.cmsmadesimple.org/index.php/topic,4449.0/topicseen.html#msg24593

There has been some confusion which is correct with quotes or without.. 

http://www.w3.org/TR/REC-CSS2/colors.html#background-properties

w3 says it should be with quotes.. but Ive seen some comments against using
quotes (and whether to use single or double quotes)

should be easy to fix though