Hello and thank you for your reply. I didn't manage to get this to work correctly. If I run npm start before importing the scss, it works (client side), but if I restart the server npm start I get this error: I: \dev\mern\NewApp\node_modules\react-toolbox\lib\ripple\theme. scss: 1 (function (exports, require , module , __filename , __dirname ) { @ import "../ colors "; ^ SyntaxError: Unexpected token ILLEGAL at Object.exports.runInThisContext (vm. js: 53 : 16 ) at Module._compile ( module . js :513:28) at Module._extensions..js ( module . js :550:10) at Object. require .extensions.(anonymous function) [as .js] ( I: \dev\mern\NewApp\node_modules\babel-register\lib\node. js: 166 : 7 ) at Module.load ( module . js :458:32) at tryModuleLoad ( module . js :417:12) at Function.Module._load ( module . js :409:3) at Module. require ( module . js :468:17) at require (internal/ module . js :20:19) at Object.<anonymous> ( I: \dev\mern\NewApp\node_modules\react-toolbox\lib\ripple\index. js: 13 : 14 ) at Module._compile ( module . js :541:32) at Module._extensions..js ( module . js :550:10) at Object. require .extensions.(anonymous function) [as .js] ( I: \dev\mern\NewApp\node_modules\babel-register\lib\node. js: 166 : 7 ) at Module.load ( module . js :458:32) at tryModuleLoad ( module . js :417:12) at Function.Module._load ( module . js :409:3) [nodemon] app crashed - waiting for file changes before starting... Could you please provide more precise indications to where to put the loader (which webpack file) and where to put the import. Best,