Edit in JSFiddle

    var t = new NetChart({
        container: document.getElementById("demo"),
        area: { height: null },
        data: { url: "https://zoomcharts.com/dvsl/data/net-chart/basic-example.json" }
    });

<script src="https://cdn.zoomcharts-cloud.com/1/latest/zoomcharts.js"></script>
<content>
<div id="demo"></div>

</content>
#demo {height:98vh}