Swap
100/0
#ffffff
90/10
#e6e6e6
80/20
#cccccc
70/30
#b3b3b3
60/40
#999999
50/50
#808080
40/60
#666666
30/70
#4d4d4d
20/80
#333333
10/90
#1a1a1a
0/100
#000000