MEDIUM_GRAY = #555

#_RESET_BUTTON
  background: transparent
  border: 0
  color: inherit
  cursor: pointer
  font: inherit
  line-height: inherit
  margin: 0
  padding: 0
  text-shadow: inherit

  &:disabled
    opacity: 0.5
    pointer-events: none

is-a-column(cols, gutter=2em)
  float: left
  margin-left: gutter

  // TODO: This isn't quite wide enough.
  column-width = unit(100 / cols, '%')
  column-extra = unit(1 / cols, unit(gutter))
  width: "calc((%s + %s) - %s)" % (column-width column-extra gutter)

  &:nth-of-type({cols}n+1)
    clear: left
    margin-left: 0