I am writing a website in Express and Handlebars. Why are the styles not included?

Question

css

Hello. I make a list of posts with a link in each "Open post". I open a post, the page is loaded, but the styles are not connected. That is, all data is displayed by id, but styles are not connected ...

const {Router} = require('express')
const Publication = require('../models/publication')
const router = Router()

router.get('/', async (req, res) => {
    const publications = await Publication.getAll()
    res.render('blog', {
        title: 'Блог',
        isBlog: true,
        publications
    })
})


router.get('/:id', async (req, res) => {
    const publication = await Publication.getById(req.params.id)
    res.render('publication', {
        title: 'Пост',
        isBlog: true,
        publication
    })
}) 


module.exports = router