Function creates border for text. Default 5 steps and color white.

Text-shadow border

@function shadows($max: 5, $color: white){
  $out: null;
  
  @for $i from 0 through $max {
    $pos: #{$i}px;
    $pos-n: -$pos;
    $shadow-t-l: $pos-n $pos-n 0 $color;
    $out: append( $out, $shadow-t-l, comma );
    $shadow-t-r: $pos $pos-n 0 $color;
    $out: append( $out, $shadow-t-r, comma );
    $shadow-b-r: $pos $pos 0 $color;
    $out: append( $out, $shadow-b-r, comma );
    $shadow-b-l: $pos-n $pos 0 $color;
    $out: append( $out, $shadow-b-l, comma );
  
  } 
  
  $shadow-back: 0 5px 10px rgba(0,0,0,.8);
  $out: append( $out, $shadow-back, comma );
  
  @return $out;
}