ng new project
cd project

"build": {
    "builder": "@angular-devkit/build-angular:browser",
    "options": {
        "allowedCommonJsDependencies": [
            "@master/css"
        ]
        …
    }
    …
},

import '@master/css';
import { enableProdMode } from '@angular/core';

ng serve

<h1 class="font:40 font:heavy italic m:50 text:center"> 
    Hello World 
</h1>

import '@master/css';
import { Style, StyleSheet } from '@master/css';
import { render } from '@master/css/render';
import { APP_BASE_HREF } from '@angular/common';
import * as express from 'express';
import { join } from 'path';
import { existsSync } from 'fs';
import { AppServerModule } from './src/main.server';
import { ngExpressEngine } from '@nguniversal/express-engine';
let DIST_BROWSER_FOLDER = join(process.cwd(), 'dist/docs/browser')
if (!existsSync(DIST_BROWSER_FOLDER)) {
    DIST_BROWSER_FOLDER = join(process.cwd(), 'browser')
}
export function app(): express.Express {
    const server = express()
    const indexHtml = existsSync(join(DIST_BROWSER_FOLDER, 'index.original.html')) 
        ? 'index.original.html' 
        : 'index';
    server.engine('html', ngExpressEngine({
        bootstrap: AppServerModule
    }))
    server.set('view engine', 'html')
    server.set('views', DIST_BROWSER_FOLDER)
    server.get('*.*', express.static(DIST_BROWSER_FOLDER, {
        maxAge: '1d'
    }))
    
    server.get('*', (req, res) => {
        res.render(indexHtml, {
            req,
            providers: [
                { provide: APP_BASE_HREF, useValue: req.baseUrl }
            ]
        }, (error: Error, html: string) => {
            if (error) {
                console.error(error)
            } else {
                res.send(render(html, { StyleSheet }).html)
            }
        })
    })
}