React express server rendering css @ import reports an error - Codes Helper

the project can be started normally using webpack"s devServer. After configuring ssr, css @ import reported an error

express configuration

import "@babel/polyfill"
import React from "react";
import {renderToString} from "react-dom/server";
import Home from "./src/component/Home";
import path from "path";
import express from "express";

const ROOT_PATH = path.resolve(__dirname);
const BUILD_PATH = path.resolve(ROOT_PATH, "build");
const app = express();

app.use(express.static(BUILD_PATH));
app.use("*", function (req, res) {
    res.write("<!DOCTYPE html><html><head><title>Hello HomePage</title><link href="/static/css/bundle.css" rel="stylesheet"></head><body>");
    res.write("<div id="app">");
    res.write(renderToString(<Home />));
    res.write("</div></body>");
    res.write("<script type="text/javascript" src="/static/js/bundle.js"></script>");
    res.write("</html>");
});

const server = app.listen(3000, () => {
    const host = server.address().address;
    const port = server.address().port;
    console.log("server is start at", host, port);
});
/*

Global css

@import "./iconfont.css";
@import "./color.css";
@import "./font.css";
@import "./margin.css";
@import "./size.css";
@import "./algin.css";
@import "./float.css";
@import "./display.css";

-sharproot {
    width: 100% !important;
    height: 100% !important;
}

start with babel-node. / express.js and report an error

(function (exports, require, module, __filename, __dirname) { @import "./iconfont.css";
                                                              ^
SyntaxError: Invalid or unexpected token
    at new Script (vm.js:79:7)
    at createScript (vm.js:251:10)
    at Object.runInThisContext (vm.js:303:10)
    at Module._compile (internal/modules/cjs/loader.js:657:28)
    at Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    
    ......

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if you don"t ssr, but just start the project with express, it"s no problem

import path from "path";
import express from "express";

const ROOT_PATH = path.resolve(__dirname);
const BUILD_PATH = path.resolve(ROOT_PATH, "build");
const app = express();

app.use(express.static(BUILD_PATH));
app.use("*", function (req, res) {
    return res.sendFile(BUILD_PATH + "/index.html");
});

const server = app.listen(3000, () => {
    const host = server.address().address;
    const port = server.address().port;
    console.log("server is start at", host, port);
});

normal startup

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if you need to see any more code, you can reply to me