element-ui introduced index.css error (No PostCSS Config found in ......)

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Error contents :

No PostCSS Config found in: C:\Users\Desktop\Taboo\Taboo-portal\node_modules\element-ui\lib\theme-chalk
at config.load.then (C:\Users\Desktop\Taboo\Taboo-portal\node_modules\postcss-load-config\src\index.js:55:15)
at … …

Solution :
In the project root directory create postcss.config.js file, and postcss configure:
the premise is: install a postcss-loader

module.exports = { 
    plugins: { 
      'autoprefixer': {browsers: 'last 5 version'} 
    } 
  }