swcarpentry/lesson-template — pull request #106 by BillMills (2014-12-31 06:09:47+00:00)
Title: added some challenge CSS

pulled the worthy bits out of https://github.com/swcarpentry/sql-novice-survey/pull/7 and inserted them here, per @gvwilson 's suggestion.

- adds a `.challenge` CSS class (just like the learning goals, but different color)
- removes some dead CSS from styles long past.