// stretch element height to specified top and bottom position

=stretch-y($offset-top: 0, $offset-bottom: 0)
  +stretch($offset-top, false, $offset-bottom, false)

// stretch element width to specified left and right position

=stretch-x($offset-left: 0, $offset-right: 0)
  +stretch(false, $offset-right, false, $offset-left)

// shorthand to stretch element height and width

=stretch($offset-top: 0, $offset-right: 0, $offset-bottom: 0, $offset-left: 0)
  position: absolute
  @if $offset-top
    top: $offset-top
  @if $offset-bottom
    bottom: $offset-bottom
  @if $offset-left
    left: $offset-left
  @if $offset-right
    right: $offset-right