JSFiddle - React, Tailwind, and code Playground

HTML

<div id="myFlexbox">

</div>

CSS

#myFlexbox{
  display: flex;
  background-color: red;
  height: 10px;
}

.hide{
  display: none !important;
}

JavaScript

$('#myFlexbox').addClass('hide');
$('#myFlexbox').removeClass('hide');