问css没有呈现在所有有快捷键的路由上。

EN

const express = require('express');
const xhbs = require('express-handlebars');
const app = express();

app.use(express.static('public'));

app.use(express.urlencoded({
    extended:true
}));

const port = process.env.PORT || 3000;

app.engine('handlebars', xhbs({
    defaultLayout:'main'
}));

app.set('view engine', 'handlebars')

app.get('/portfolio', (req, res)=>{//css works fine on this route
        res.render('portfolio');
});    

app.get('/portfolio/project1', (req, res)=>{//css has no effect here
    res.render('project1');
});

public
    css
        styles.css
views
    layouts
        main.handlebars
server
    server.js