JSFiddle - React, Tailwind, and code Playground

HTML

<div id="t"></div>

CSS

body {
    margin:0;
}
#t {
        width:50%;
        height:50%; 
        position:fixed;
        background:red;
      }

JavaScript

$(window).resize(function(){
     resizenow();
});
function resizenow() {
    var browserwidth = $(window).width();
    var browserheight = $(window).height();
    $('#t').css('left', (browserwidth - $(this).width())).css('top', (browserheight - $(this).height()));
});