Source Crayola® CSS3 CSS4
#5b452b
 
#714b23
raw umber
#556b2f
dark olive green
#556b2f
darkolivegreen
#7d7774
 
#757575
sonic silver
#808080
grey
#808080
grey
#393128
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey