JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <head>
        <script type="text/javascript">
            $(function () {
                alert($("#myDiv").css("width"));
            });
        </script>
    </head>
    <body>
        <div id="myDiv" style="width: 100%;"></div>
    </body>
</html>