Some useful scss mixins

_mixins.scss

@mixin longShadow ($length: 4, $color: rgba(0,0,0,0.3)){
  $shadow: "";
  @for $i from 1 to $length {
    $shadow: $shadow + $i + "px " + $i + "px 0 " + $color;
    @if $i < $length - 1 {
      $shadow: $shadow + ", "
    }
  }
  $shadow: unquote($shadow);
  box-shadow: $shadow;
}