Tech debt: address VS code warnings

[nicmart-dev]

Educators feedback was:

• There are some warnings in the VSCode console during development that could be looked into to resolve. For example "Deprecation Using / for division is deprecated and will be removed in
  Dart Sass 2.0.0."
  To fix the warning the terminal mentions how this could be done. You can import the sass math module in your variables partial @use 'sass:math'; and then change the 16 / 9 division to math.
  div(16, 9); which will resolve the warning