webpack打包css报错

配置代码：
const path = require('path');

const config = {

entry: './src/index.js',
output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist')
},
module: {
    rules: [
        {
            test: /\.css$/,
            use: [
                'style-loader',
                'css-loader'
            ]
        }
    ]
}

}

运行报错信息：
ERROR in ./src/style.css 1:0
Module parse failed: Unexpected token (1:0)
You may need an appropriate loader to handle this file type.

.hello{
| color:red;

| }
@ ./src/index.js 2:0-21