_box-shadow.scss

// Box-Shadow Mixin Requires Sass v3.1.1+
@mixin box-shadow ($shadow-1,
  $shadow-2: false, $shadow-3: false,
  $shadow-4: false, $shadow-5: false,
  $shadow-6: false, $shadow-7: false,
  $shadow-8: false, $shadow-9: false)
  {
    $full: $shadow-1;
    @each $shadow in
      $shadow-2, $shadow-3,
      $shadow-4, $shadow-5,
      $shadow-6, $shadow-7,
      $shadow-8, $shadow-9{
        @if $shadow {
          $full: $full, $shadow;
        }
      }
  -webkit-box-shadow: $full;
  -moz-box-shadow: $full;
  -o-box-shadow: $full;
  box-shadow: $full;
}