What color is Button ?

Source Crayola® CSS3 CSS4
#618997
 
#757575
sonic silver
#708090
slate gray
#708090
slategrey
#4b4334
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#909d9b
 
#979aaa
manatee
#a9a9a9
dark gray
#a9a9a9
darkgrey