i
  background: #359
b
  background: #335599
u
  background: rgba(144, 0, 0, .5)
s
  background: hsl(0, 100%, 50%)

!color1 = #359
!color2 = #335599
!color3 = rgba(144, 0, 0, .5)
!color4 = hsl(0, 100%, 50%)

/*
 * #123, #456
 */

// #123456

ul
  color = white
  li
    color = yellow
    background = black