Fixes Bug 1047562 - Fixing cut off text in mobile breakpoints. 

Centering thumbnail image.
- Going forward, I’m hoping we can focus on a more “mobile-first” approach on any additions we make to the Less codebase, so ideally this would be re-worked into a `min-width` media query.

Additionally, the standard syntax for viewport variables in media queries is to use `@screen-sm` or `@screen-sm-min` for a `min-width` attribute.