What color is Poster, IBM / Productivity ?

Source Crayola® CSS3 CSS4
#677796
 
#757575
sonic silver
#708090
slate gray
#708090
slategrey
#9aa4b8
 
#979aaa
manatee
#a9a9a9
dark gray
#a9a9a9
darkgrey
#404f6d
 
#4a646c
deep space sparkle
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey