Bourbon Fundamentals - Radial Gradient Mixin

This topic is for the [Radial Gradient Mixin] exercise in the [Bourbon Fundamentals] trail. Post any questions, corrections, or pointers you have to share with other Upcase subscribers.
[Radial Gradient Mixin]: https://exercises.upcase.com/exercises/radial-gradient-mixin
[Bourbon Fundamentals]: Bourbon Fundamentals | Online Tutorial by thoughtbot