What color is Steel button Button ?

Source Crayola® CSS3 CSS4
#534c41
 
#414a4c
outer space
#556b2f
dark olive green
#556b2f
darkolivegreen
#312723
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#726d5d
 
#757575
sonic silver
#696969
dim grey
#696969
dimgrey
#97927f
 
#95918c
gray
#808080
grey
#808080
grey