SCSS: 3d shadow

_shadow-3d.scss

// usage text-shadow / box-shadow : shadow-3d($color, $length);
// adds pseudo-3d vertical shadow

@function shadow-3d($col, $h){
	$str : "";
	$shadow-col : darken($col, 5%);
		@for $i from 1 through $h{
			$str : "#{$str} 0 #{$i}px 0 #{$shadow-col},";  
		} 

			$str : "#{$str} 0 #{$h}px 10px rgba(0,0,0,.6), 0 #{$h}px 4px rgba(0,0,0,.4)"  ;
		
		@return unquote($str);
}