为什么运行时颜色没有变红。

"css-loader": "^3.6.0",

    "style-loader": "^1.2.1",

module.exports = {

    entry:"./src/main.js",

    output:{

        path:path.resolve(__dirname,'dist'),

        filename:'main.js'

    },

    module:{

        rules:[

            {

                test:/\.css$/,

                use:['style-loader','css-loader']

            }

        ]

    },

    mode:"development"

};