Darker/lighter shades: Hex values:
  #000000
  #1A0000
  #330000
  #4C0000
  #660000
  #800000
  #990000
  #B20000
  #CC0000
  #E60000
  #FF0000
#FF1919
#FF3333
#FF4D4D
#FF6666
#FF8080
#FF9999
#FFB2B2
#FFCCCC
#FFE6E6
#FFFFFF