Personally, I am using CSS Modules with Less as preprocessor, mostly because of constants, color functions and the occasional mixin. I resort to inline styles

Personally, I am using CSS Modules with Less as preprocessor, mostly because of constants, color functions and the occasional mixin. I resort to inline styles and sometimes Radium when I deal with highly dynamic styles, usually sizing and positioning for things like popups. While I like inline styles in general, the editor support is a bit lacking compared to working with Less files.