protected function generateCss() {
		$styles = Container::get( 'Styles' );
		$scss = $this->getScssVars();

		if ( $styles->isCurrentThemeCompatible( 1 ) ) {
			$scss .= "@import 'fonts-prince'; \n";
		} elseif ( $styles->isCurrentThemeCompatible( 2 ) ) {
			$scss .= "@import 'fonts'; \n";
		}
		$scss .= \Pressbooks\Utility\get_contents( PB_PLUGIN_DIR . 'assets/covergenerator/_jpg.scss' );

		$css = $styles->customize( 'prince', $scss );
		$css = \Pressbooks\Sanitize\normalize_css_urls( $css );

		if ( WP_DEBUG ) {
			Container::get( 'Sass' )->debug( $css, $scss, 'cover-jpg' );
		}

		return $css;
	}