What color is Button ?

Source Crayola® CSS3 CSS4
#453f37
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#746e67
 
#757575
sonic silver
#696969
dim grey
#696969
dimgrey
#47575f
 
#4a646c
deep space sparkle
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey