@mixin absolute($l: 0, $t: 0, $positionX: 'left', $positionY: 'top') {
  position: absolute;
  @if $positionX == 'left' {
    left: $l;
    right: auto;
  } @else {
    left: auto;
    right: $l;
  }
  @if $positionY == 'top' {
    top: $t;
    bottom: auto;
  } @else {
    top: auto;
    bottom: $t;
  }
}