Tailwind + Svelte + Rollup

This is a demo using:

• Tailwind CSS
• Svelte
• Rollup
• Purgecss

HTML + CSS + JS assets weigh about 11kB (not gzipped). Of course a larger site/app would have much more to it, but this is a pretty good starting point given that a site using React is a minimum of around 120kB and many drop-in CSS frameworks can be 100-200kB. Starting small and with what you actually need is good.