Nuxt/examples/with-element-ui/nuxt.config.js

module.exports = {
  /*
  ** Global CSS
  */
  css: [
    'element-ui/lib/theme-chalk/index.css'
  ],

  /*
  ** Add element-ui in our app, see plugins/element-ui.js file
  */
  plugins: [
    '@/plugins/element-ui'
  ]
}