Using Sass

Sass (Syntactically Awesome Style Sheets)

Sass is a scripting language that is interpreted or compiled into Cascading Style Sheets (CSS). It is the most mature, stable, and powerful professional grade CSS extension language in the world. Sass gives you the power of variables, mixins, functions, etc.

Compiling Sass

Again, if you are not using Node.js and Vite setup, don't like command line interface there is another way to work with preprocessors. Visit it's website at https://vitejs.dev/. Basic version is completely free and available for Mac and Windows.