JSFiddle - React, Tailwind, and code Playground

HTML

<html>
<head>
<style type="text/css">
#box{
    height:100px;
    border:3px;
    border-style:solid;
    border-color:#000;
}
</style>

</head>
<body>
<div id="box"></div>
    <script>
document.getElementById('box').style.width="10px";
</script>