webpack热模块更换：css不刷新

我正在尝试webpack,几乎得到了相同的行为,除了一个例外：当CSS改变时,它刷新整个窗口.是否有可能使其不刷新CSS

配置到目前为止

var webpackConfig = {
    entry: ["webpack/hot/dev-server",__dirname + '/app/scripts/app.js'],debug: true,output: {
        path: __dirname + '/app',filename: 'scripts/build.js'
    },devtool: 'source-map',plugins: [
        new webpack.HotModulereplacementPlugin(),new htmlWebpackPlugin({
            template: __dirname + '/app/index.html',inject: 'body',hash: true,config: config
        }),new webpack.ProvidePlugin({
            'angular': 'angular'
        }),new ExtractTextPlugin("styles.css")
    ],module: {
        loaders: [
            {
                test: /\.scss$/,loader: "style!css!sass?includePaths[]=" + __dirname + "/app/bower_components/compass-mixins/lib&includePaths[]=" + __dirname + '/instance/sth/styles&includePaths[]=' + __dirname + '/app/scripts'
            }
        ]
    }
};