I'm using Angular Material2 mixins to build different theme in a file called my-theme.scss. When compiling the project for production, `ng build` will generate a style file called `styles.xxxxxxxxxxx.bundle.css`. 

If I want to build a different theme for a particular client after deploying to production server, is there a way to override the theme without recompile and redeploy the app? For example, externalize the css for theme, etc.?

Please note that I don't want to override the customized styles for particular component but only the theme built using Angular Material mixins.