Copy the files frigg-sdk.js and frigg-base.css in your project

Or link them :

    <link rel="stylesheet" type="text/css" href="https://static.systeme-frigg.org/frigg-sdk-js-latest/src/frigg-base.css">
    <script type="text/javascript" src="https://static.systeme-frigg.org/frigg-sdk-js-latest/src/frigg-sdk.js"></script>