JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
<div class="selector">Something</div>
</div>

CSS

.fixed-dialog{
  position: fixed;
  top: 50px;
  left: 50px;
}


#container {
    height: 5000px;
}

JavaScript

$(document).ready(function(){
    $( ".selector" ).dialog({ dialogClass: 'fixed-dialog' });
});