@mixin position ($position: relative, $coordinates: 0 0 0 0) {

@if type-of($position) == list {
  $coordinates: $position;
  $position: relative;
}

$top: nth($coordinates, 1);
$right: nth($coordinates, 2);
$bottom: nth($coordinates, 3);
$left: nth($coordinates, 4);

position: $position;

@if $top == auto {
  top: $top;
}
@else if not(unitless($top)) {
  top: $top;
}

@if $right == auto {
  right: $right;
}
@else if not(unitless($right)) {
  right: $right;
}

@if $bottom == auto {
  bottom: $bottom;
}
@else if not(unitless($bottom)) {
  bottom: $bottom;
}

@if $left == auto {
  left: $left;
}
@else if not(unitless($left)) {
  left: $left;
}

}