What color is Border (Belgium) ?

Source Crayola® CSS3 CSS4
#1d111d
 
#000000
black
#000000
black
#000000
black
#b4bec6
 
#b0b7c6
cadet blue
#c0c0c0
silver
#c0c0c0
silver
#2b313e
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey
#6d767e
 
#757575
sonic silver
#708090
slate gray
#708090
slategrey
#4d4f59
 
#414a4c
outer space
#2f4f4f
dark slate gray
#2f4f4f
darkslategrey