// in terminal
// If you use npm
npm install sass-loader node-sass --save-dev
// If you use yarn 
yarn add sass-loader node-sass

// In your component
<style lang="scss">
  // ...
</style>

# /!\ if you work with vue@2.6.12, it seems sass-loader@11.0.0 doesn't work
# So, in terminal:
yarn add node-sass sass-loader@10.1.1

<style lang="scss">
/* write SCSS here */
</style>