Source Crayola® CSS3 CSS4
#2c3334
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#66818a
 
#757575
sonic silver
#708090
slate gray
#708090
slategrey
#44585e
 
#4a646c
deep space sparkle
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#bad9ce
 
#c5d0e6
periwinkle
#d3d3d3
light gray
#d3d3d3
lightgrey