postcss.config.js

export default {
  plugins: {
    'postcss-import': {
      path: ['src/css']
    },
    'postcss-preset-env': {
      stage: 1,
      browsers: ['>0.3%', 'Firefox ESR', 'not dead', 'not op_mini all'],
      features: {
        'custom-properties': {
          strict: false,
          warnings: false,
          preserve: true
        }
      }
    }
  }
}