=outer-table-borders($width: 2px, $color: black)
  border: $width solid $color
  thead
    th
      border-bottom: $width solid $color
  tfoot
    th, td
      border-top: $width solid $color
  th
    &:first-child
      border-right: $width solid $color

=inner-table-borders($width: 2px, $color: black)
  th, td
    border:
      right: $width solid $color
      bottom: $width solid $color
      left-width: 0px
      top-width: 0px
    &:last-child,
    &.last
      border-right-width: 0px
  // IE8 ignores rules that are included on the same line as :last-child
  // see http://www.richardscarrott.co.uk/posts/view/ie8-last-child-bug for details
  tbody, tfoot
    tr:last-child
      th, td
        border-bottom-width: 0px
    tr.last
      th, td
        border-bottom-width: 0px
