Sass rules not rendering in preview pane

https://www.codecademy.com/en/courses/learn-sass/lessons/mixins-and-parent-selector/exercises/mixins-ii?action=lesson_resume&link_content_target=interstitial_undefined

As I progress through this lesson, the preview / browser demo does not appear to be changing in any way.

I am able to successfully complete the steps and move forward in the exercise, however the results of the new sass code is not displaying- ie. a blank white box, no lines, no ‘college rule’ visual.

is this intentional?
has this happened for anyone else?

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