public function position(string $position): Log
    {
        $acceptablePositions = [
            'top right',
            'top left',
            'bottom right',
            'bottom left'
        ];

        if (array_search(strtolower($position), $acceptablePositions) === false) {
            $acceptablePositions = implode(', ', $acceptablePositions);
            throw new \Exception("position can only be: ${acceptablePositions}");
        }

        $this->position = $position;
        Alertify::flash();
        return $this;
    }