/*
* Add position property
*
* @param {String} $position - relative | absolute | fixed
* @param {Length} $args - List direction property and value
*
* @example
* - Usage:
* .foo {
*    @include position(relative, top 0 left 1em);
* }
* - Output:
* .foo {
     position: relative;
     top: 0;
     left: 1em;
* }
* ...or other way :
* .foo {
*    @include position(relative, '');
* }
*/
@mixin position($position, $args) {
  @each $o in top right bottom left {
      $i: index($args, $o);

      @if $i and $i + 1<= length($args) and type-of(nth($args, $i + 1)) == number {
          #{$o}: nth($args, $i + 1);
      }
  }

  position: $position;
}