public function getImageAlignmentClass($viewport, $value)
    {
        if ($value) {
            
            $class = [$this->getStyle('image')];
            
            $class[] = $this->getStyle('viewport', $viewport);
            
            $class[] = $this->getStyle('align', $value);
            
            return implode('-', array_filter($class));
            
        }
    }