You may have heard some news about the fact that a new theme has been added to Drupal, named Classy. But what kind of theme is it exactly? Is it a pretty new look for Drupal 8? Well, no. You will still see Bartik as the default theme on your Drupal 8 site, so why another theme? Classy is a new base theme in core, which Bartik and Seven will then use as their bases. The idea here is to provide more flexibility to themers when it comes to choosing default CSS classes.