用ant design為啥樣式?jīng)]有顯示出來(lái)

import { Button } from 'antd';
import ReactDOM from 'react-dom';
import React from 'react';
import 'antd/dist/antd.css';

ReactDOM.render(
    <div>
        <Button type="primary">Primary</Button>
        <Button>Default</Button>
        <Button type="dashed">Dashed</Button>
        <Button type="danger">Danger</Button>
    </div>,
    document.getElementById('app'));

webpack.config.js

path = require('path');
HtmlPackagePlugin = require('html-webpack-plugin');

module.exports = {
    entry: './src/app.js',
    output: {
        path: path.resolve(__dirname, './dist/js')
    },
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [
                    {loader: 'style-loader'},
                    {
                        loader: 'css-loader',
                        options: {
                            modules: true,
                            importLoaders: 1
                        },
                    },
                    {loader: 'postcss-loader'}
                ]
            },
            {
                test: /\.html$/,
                use: 'html-loader'
            },
            {
                test: /\.tpl$/,
                use: 'ejs-loader'
            },
            {
                test: /\.(png|jpg|gif|svg)$/i,
                use: 'file-loader'
            },
            {
                test: /\.less$/,
                use: [{
                    loader: "style-loader"
                }, {
                    loader: "css-loader"
                }, {
                    loader: "less-loader", options: {
                        strictMath: true,
                        noIeCompat: true
                    }
                }]
            },
            {
                test: /\.js$/,
                use: [
                    {
                        loader: 'babel-loader',
                    }
                ]
            }
        ]
    },
    plugins: [
        new HtmlPackagePlugin({
            filename: 'index.html',
            template: './src/index.html',
            inject: 'body',
        })
    ]
};

為什么顯示不出來(lái)