Here is an example of using the Expandable Card in a plain html page:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<link href="https://developer.temenos.com/uux/base.css" rel="stylesheet" />
<script src="https://developer.temenos.com/uux/unified-ux-web.min.js"></script>
</head>
<body>
<uwc-expandable-card heading="Expandable card title" description="Optional description"></uwc-expandable-card>
</body>
</html>