What color is Button ?

Source Crayola® CSS3 CSS4
#253a5b
 
#1a4876
midnight blue
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#49576f
 
#4a646c
deep space sparkle
#696969
dim grey
#696969
dimgrey
#767e8f
 
#757575
sonic silver
#708090
slate gray
#708090
slategrey