In B2B software development, adapting app styles to match clients' branding is crucial. But managing separate CSS files for each client quickly becomes impractical.

With database-driven themes, updating branding is as simple as a database edit, saving hours of development time and enabling clients to manage their own themes (through the UI) for a seamless user experience.

1. Run npm install to install dependencies.

2. Run npm run server to start the backend server (server.ts) on port 3000. The server keeps an in-memory database of the client themes and products.

3. In another terminal, run npm start to start the Angular dev server on port 4200.

4. Navigate to http://localhost:4200/

• Instant Branding Updates: By storing themes in the database, developers can effortlessly update branding with a simple row edit, eliminating the need for extensive development cycles.

• Seamless User Experience: Since themes are just data, we can create an API and UI for users to update their own branding without the need for developer intervention.

• Dynamic CSS Variables: Leveraging document.documentElement.style.setProperty(), we can dynamically set CSS variables at runtime.

• Dynamic Font Loading: Utilizing dynamically-generated <link> elements, we can import Google Fonts (or any other fonts) at runtime.

• Route Resolver: Avoid a "flash of unstyled content" by loading the theme in a route resolver, before components are rendered.

• theme.service.ts
• theme.resolver.ts
• app.routes.ts