From that same page was another solution in [a comment dated August 5, 2013](http://css-tricks.com/spacing-the-bottom-of-modules/#comment-504672).

```css
.module > *:last-child:after {
  content: ' ';
  margin: 1em 0 -1em;
  padding: 0;
  display: block;
  height: 0;
}
```
Thoughts?