docs: function gutter(
    math = settings.math,
    columns = settings.columns,
    multiplier = 1
  ) {
    const gutterWidth = _calculateGutter(multiplier);
    const containerWidth = _updateContext(
      typeof columns === "string" ?
      parseInt(columns, 10) :
      columns
    );
  
    if (math === "static") {
      return _staticCalculation(gutterWidth);
    }
  
    if (math === "fluid") {
      return _percent(gutterWidth, containerWidth);
    }
  
    return false;
  }