open atrium css

Hi folks,

Apologies in advance for the daft queries, just delving into Drupal/Open Atrium for the first time.

I've been attempting to make some edits to the oa home page, and while editing the content is no problem, it appears the source CSS runs through some build process? Is there a way to commit changes I make in the source CSS? For reference, the CSS I'm editing is here;

/profiles/openatrium/modules/apps/oa_home/oa_home_default.css