JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
    width: 600px;
    margin: 0 auto;
    background: mediumSeaGreen;
}

JavaScript

function divHeight() {
  var dH = $(window).height();


  $('div').css({
      height: dH
  });
}

divHeight();
$("body").css({'height':'50%'});