public function run($scss_folder, $format_style = "scss_formatter")
    {

        // scssc will be loaded automatically via Composer
        $scss_compiler = new Compiler();
        $bootstrap_folder = __DIR__.'/../../../../../../node_modules/bootstrap/scss';
        $flag_folder = __DIR__.'/../../../../../../node_modules/flag-icon-css/sass'; 
        // set the path where your _mixins are
        $scss_compiler->setImportPaths(array($flag_folder,$bootstrap_folder,$scss_folder));
        // set css formatting (normal, nested or minimized), @see http://leafo.net/scssphp/docs/#output_formatting
         $scss_compiler->setFormatter('Leafo\ScssPhp\Formatter\Compressed');
        // get all .scss files from scss folder
        $filelist = glob($scss_folder . "/*.scss");
        // step through all .scss files in that folder
        foreach ($filelist as $file_path) {
            // get path elements from that file
            $file_path_elements = pathinfo($file_path);
            // get file's name without extension
            $file_name = $file_path_elements['filename'];
            // get .scss's content, put it into $string_sass
            $string_sass = file_get_contents($scss_folder .'/'. $file_name . ".scss");
            // compile this SASS code to CSS
            $string_css = $scss_compiler->compile($string_sass);
            $this->container['FileManager']->add('text/css', '/css/'. $file_name . ".css", $string_css);
        }
    }