To use Classic CSS from a import/link, use one of these three code snippets based on what you're using and what you know.
Your code may error with this due to concurrent everchanging formats of Classic CSS.
Download a package from the downloads page to get fixed code.
<link rel="stylesheet" href="http://tinyaviator.com/classic_css/classic.css">
import "http://tinyaviator.com/classic_css/classic.css"
npm install classic_css