The Recent Posts element in Cornerstone are admittedly lean, but one simple change you can make is to add the post excerpt to them.
While this is something that gets asked frequently, and the code needed to achieve it has been posted by Themeco, many can benefit by having it here. We’re much easier to find than a forum search!
Here’s how you can add excerpts into recent posts.
The following code should be placed in your functions.php file inside your x-child theme.
Furthermore, it’s good to understand how something functions. The code above works by removing the recent posts shortcode from WordPress, and re-initializing it with a new function that pulls the post excerpt from the database and places it into the post box. Finally, you can use CSS to customize the look and feel of the text simply by targeting the .x-recent-posts-excerpt class.