Also worth mentioning that you can avoid having to deal with most of the problems of the multiple syntaxes if you're using sass by using bourbon's mixins - http

Also worth mentioning that you can avoid having to deal with most of the problems of the multiple syntaxes if you're using sass by using bourbon's mixins - http://bourbon.io/docs/#flexbox http://bourbon.io/docs/#flexbox (or you can just not care about < IE11...)