Source Crayola® CSS3 CSS4
#28292b
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#3c5a69
 
#4a646c
deep space sparkle
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#718084
 
#757575
sonic silver
#708090
slate gray
#708090
slategrey