@function decimal-round ($number, $digits: 0, $mode: round) {
  $n: 1;

  @if type-of($number) != number {
    @warn '#{ $number } is not a number.';
    @return $number;
  }

  @if type-of($digits) != number {
    @warn '#{ $digits } is not a number.';
    @return $number;
  }
  @else if not unitless($digits) {
    @warn '#{ $digits } has a unit.';
    @return $number;
  }

  @for $i from 1 through $digits {
    $n: $n * 10;
  }

  @if $mode == round {
    @return round($number * $n) / $n;
  }
  @else if $mode == ceil {
    @return ceil($number * $n) / $n;
  }
  @else if $mode == floor {
    @return floor($number * $n) / $n;
  }
  @else {
    @warn '#{ $mode } is undefined keyword.';
    @return $number;
  }
}

@function decimal-ceil ($number, $digits: 0) {
  @return decimal-round($number, $digits, ceil);
}

@function px-to-rem($px) {
  @return unquote(decimal-ceil($px / 16, 4) + "rem");
}