Does anybody else experiencing a lot of bugs in the Sass Lessons? Even if correct answers we’re submitted it get errors.
Are you by any chance using Edge, IE, or Safari as your browser? These have decided not to implement new features of JS and CSS according to web standards and as a result they often exhibit unintended (and frustrating) behavior.
Bugs should always be reported as GitHub Issues. Whenever reporting a bug, please check first that there isn’t already an issue for it and provide as much detail as possible.