Using the CSS
So, I assume you want to use the CSS, yes? Fear not, as we shall tutor you through it.
Importing the CSS
Let's start by importing the CSS. If you went to the Downloads page, and downloaded the CSS file manually, you can place it in the root of your site, and link rel to it.
However, the most simple way is to directly link to 2006.css across the web. Link a stylesheet, and the href should be "https://conistuffwow.github.io/2006.css/css/2006.css".
Alas, you are ready to start building your website!