You just need to copy the URL of the files you want to use for Semantic UI, and put it in your header under a script or link tag as the “src” or “href” value.
For Semantic UI, you need three files for general use:
- semantic.min.css
- jquery.min.js (from JQuery CDN)
- semantic.min.js
For example:
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8" />
<title>Semantic UI CDN</title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/1.11.8/semantic.min.css"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/1.11.8/semantic.min.js"></script>
</head>
<body>
<!-- Your Semantic UI Code -->
</body>
</html>