how to use html pug and scss in glitch. just the way u can do it in code pen
SASS/SCSS is a CSS preprocessor that runs on the server and compiles to CSS code that your browser understands.
I recommend trying one of Glitch’s Node starters or finding a similar template app that uses Express if you don’t want to use Fastify. Pug is a templating engine for Node. But it will not be the same experience as Codepen.