body
  // border
  .is-border-none
    border: none
  .is-horizontal-border-none
    +border(horizontal, none)
  .is-vertical-border-none
    +border(vertical, none)
  .is-border-left
    border-left: none
  .is-border-right
    border-right: none
  .is-border-top
    border-top: none
  .is-border-bottom
    border-bottom: none