Sass Fundamentals - At Home with Nesting

This topic is for the [At Home with Nesting][] exercise in the [Sass Fundamentals][] trail. Post any questions, corrections, or pointers you have to share with other Upcase subscribers.
[At Home with Nesting]: https://exercises.upcase.com/exercises/nesting-in-sass
[Sass Fundamentals]: https://thoughtbot.com/upcase/sass-fundamentals