message: Don't lighten privacy colored button border
diff: .Button
  &--public
  color colors-channel-public
  - border-color lighten(@color, 75%)
  + border-color @color
  &:hover
  background-color colors-channel-public
  border-color @background-color
  &--private
  color colors-channel-private
  - border-color lighten(@color, 75%)
  + border-color @color
  &:hover
  background-color colors-channel-private
  border-color @background-color
  &--closed
  color colors-channel-closed
  - border-color lighten(@color, 75%)
  + border-color @color
  &:hover
  background-color colors-channel-closed
  border-color @background-color
  