position mixin

position.scss

@mixin position(
  $position: absolute, 
  $top: null, 
  $right: null, 
  $bottom: null, 
  $left: null
) {
  position: $position;
  top: $top;
  right: $right;
  bottom: $bottom;
  left: $left;
}

// usage
// demo: http://codepen.io/liljalinus/pen/Esqhw
.box {
  @include position(absolute, 50px, null, null, 50px);
  width: 100px;
  height: 100px;
  background: red;
}

Alternative usage, more semantic and almost negates the need for commenting :) @include position(absolute, $top: 0, $left: 1.5rem);