The minified build is about 12 kB gzipped.
Semantic HTML, styled
This page is plain markup, a few classes and one stylesheet.
Twenty color themes, light and dark from one file.
Cascade layers, OKLCH colors and no Sass.
FAQ
Do I need JavaScript?
No. The modal on this page uses two lines, everything else is plain HTML.
Does it follow the system color scheme?
Yes. Set data-theme="light" or "dark" on html to
force one.