If the only reason a bundler is needed here is for SCSS, I'd just use CSS/variables and that's it. Static, no bundler. The benefit of more advanced CSSing is hardly worth the effort unless you spend most of your time styling pages, and in any case, modern CSS is flexible enough on its own.

I would understand using such approach with smth like Tailwind... or any other CSS framework... but this is overkill.

Just `live-server` (https://www.npmjs.com/package/live-server) will serve better.