Certain css style at active pages

Hi. I want to change the css style at the links from Recent Articles widget, so when i’m on a certain page the link to be with a css style called “active”. Its something like the links from the pages widget, where says

if ( !empty($current_page) ) {
			$_current_page = get_page( $current_page );
			if ( isset($_current_page->ancestors) && in_array($page->ID, (array) $_current_page->ancestors) )
				$css_class .= 'active';
			if ( $page->ID == $current_page )
				$css_class .= 'active';
			elseif ( $_current_page && $page->ID == $_current_page->post_parent )
				$css_class .= 'active';
		} elseif ( $page->ID == get_option('page_for_posts') ) {
			$css_class .= 'active';
		}

i want to do something like this but for the recent articles. How to do it ?