JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#">Click me</a>

<div id="loader"></div>

CSS

#loader {
    background: #ccc;
}

JavaScript

var height = $(window).height() / 2;

      $("a").click(function(){

        $("#loader").css('margin-top', height+'px');
        $("#loader").text(height);

      });