=valign-parent
  white-space: nowrap

  &::before
    content: ''
    display: inline-block
    height: 100%
    vertical-align: middle
    margin-right: -0.25em

=valign-child
  display: -moz-inline-box
  display: inline-block
  vertical-align: middle
  white-space: normal
  text-align: left

.valign-parent
  +valign-parent

.valign-child
  +valign-child