https://getmdl.io/ https://materializecss.com/ https://blueprintjs.com/ -> find an alternative
https://purecss.io/forms/ https://minicss.org/docs#progress-bars https://getbasis.github.io/component.html#navbar
https://picturepan2.github.io/spectre/components/popovers.html ++ dark theme: https://codesandbox.io/s/zzn5w