JSFiddle - React, Tailwind, and code Playground
HTML
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<div style='height: 800px; background-color: blue;'>
</div>JavaScript
var message = 'hello world';
$('body').prepend('<div class="alert alert-warning newalert" style="width: 100%;height: 50px;position:fixed;z-index: 999999999;"><strong>'+message+'</strong></div>');