Astra_Minify::get_http2_css_files()

		public static function get_http2_css_files() {

			// Get the css key.
			$css_slug  = self::_asset_slug();
			$css_files = get_option( self::$_css_key . '-files-' . $css_slug, array() );

			// No css files, recompile the files.
			if ( ! $css_files ) {
				self::render_http2_css();
				return self::get_http2_css_files();
			}

			// Return the url.
			return $css_files;
		}