Ah ha! Thank you @gabitoesmiapodo,
At this stage of the tutorial the components are declared as…
styleUrls: ["./list-common.css", "./list.css"]
styleUrls: ["./pages/login/login-common.css", "./pages/login/login.css"],
I hadn’t noticed the …
…and I missed any reference to it in the tutorial. I am also watching the video of the tutorial and noticed that it was using the full path, but couldn’t see why it was working in their code.