Add the CSS from the node_modules folder using angular cli

I've installed a new library with npm, so far so good. Now I want to import the css in there to my project, obviously I shouldn't link directly to the node_modules folder. So, is there a simple to do import this to my project? I'm using Angular CLI.

I have an idea, but I'm not sure if it's a good idea - I thought about installing gulp/grunt and then require the style there and output it as vendor.css into my project. Is it even possible?