This system is based on the video tutorials by Cédric Hauteville you can watch them here: https://www.youtube.com/playlist?list=PLFV9z59nkHDccUbRXVt623UdloPTclIrz parts of it were also lifted from the Foundry VTT Boilerplate system by XXX.
Dice shapes are licensed under Creative Commons Attribution-Noncommercial-Share Alike 3.0 License and appear from https://www.deviantart.com/jpatterson/art/Polyhedral-RPG-Gaming-Dice-Dec-2014-502024799 created by jpatterson
This system uses less for CSS you can see a good installation guide for VSCode at https://code.visualstudio.com/docs/languages/css#_transpiling-sass-and-less-into-css