yClass {
            background: red;
        }

        body {
            font: 14px helvetica neue, helvetica, arial, sans-serif;
        }

    </style>


    <script type="text/javascript">
        window.MyLib = {};
        if (window['cytoscape'] === undefined) {
            console.log('starting loading');

            requirejs.config({

                paths: {
                    'popper': 'https://unpkg.com/popper.js@1.14.1/dist/umd/popper',
                    'tippy': 'https://cdnjs.cloudflare