Nuxt/examples/global-css/nuxt.config.js

module.exports = {
  head: {
    meta: [
      { charset: 'utf-8' },
      { name: 'viewport', content: 'width=device-width, initial-scale=1' },
      { hid: 'description', name: 'description', content: 'Meta description' }
    ]
  },
  css: [
    'bulma/css/bulma.css',
    '~/css/main.css'
  ]
}