The quickest way to get the UCLA Design System into your project is using the CDN-hosted assets.
Copy and paste this in the <head> of your document before any other stylesheet
<link rel="stylesheet" crossorigin="anonymous" integrity="sha384-4ZDNqh7tdG/7K7msMXXlz3BRKqPF45hW2BuHVoycMVJGUB5Y+Tw0vX7Ch5/hVV2S" href="https://cdn.designsystem.brand.ucla.edu/build/v2.0.0/css/ucla-lib.min.css" />
Copy and paste this before the closing </body> tag.
<script type="text/javascript" crossorigin="anonymous" integrity="sha384-qhkfDxMBbxXrPP843ofQ/2ZDslD8lSruy5RdW1UsKAV6/MExkRIthwyy76QRgEKP" src="https://cdn.designsystem.brand.ucla.edu/build/v2.0.0/js/ucla-lib-scripts.min.js" />
If you would like to host the assets yourself, you can download the compiled version here.