The CDN links are pointing to version 6.3.0, which is not available on cdn.jsdelivr.net.
```html
<!-- Compressed CSS -->
-<link rel="stylesheet" href="https://cdn.jsdelivr.net/foundation/6.3.0/foundation.min.css">
+<link rel="stylesheet" href="https://cdn.jsdelivr.net/foundation/6.2.3/foundation.min.css">
<!-- Compressed JavaScript -->
-<script src="https://cdn.jsdelivr.net/foundation/6.3.0/foundation.min.js"></script>
+<script src="https://cdn.jsdelivr.net/foundation/6.2.3/foundation.min.js"></script>
```
---