public function renderLegacyCss()
    {
        $cssFiles = [];
        $cssCodeLines = [];

        foreach ($this->legacyHelper->get('css_files', []) as $cssItem) {
            // List of items can contain empty elements, path to files or code
            if (!empty($cssItem)) {
                if (isset($cssItem[5]) && $this->isFile($cssItem, '.css')) {
                    $cssFiles[] = $cssItem;
                } else {
                    $cssCodeLines[] = $cssItem;
                }
            }
        }

        return $this->environment->render(
            $this->cssTemplate,
            [
                'css_files' => $cssFiles,
                'css_code_lines' => $cssCodeLines,
            ]
        );
    }