I prefer to colocate into 1 folder. index.jsx, index[.css,.styl,.scss, etc.]
Just like my JS requires different JS files, my CSS imports various files too. The preprocessor turns that into 1 css file (or n, if you want).
Just like my JS requires different JS files, my CSS imports various files too. The preprocessor turns that into 1 css file (or n, if you want).