JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.4.js"></script>
<img src="http://cisloandthomas.com/wp-content/uploads/2015/12/Shrunken-Banner-Wide-Ends-1140x200.jpg" class="background">
<div class="overlay"></div>

CSS

.background {
  height: 100%;
  position: absolute;
  margin-top: -61px;
}

.overlay {
  position: absolute;
  height: 20px;
  width: 20px;
  background: red;
}

JavaScript

var resizeOverlay = function() {
  var windowHeight = $(window).height();
  
  var left = windowHeight * 1.07;
  var bottom = (windowHeight * .63) + 61;
  
  $(".overlay").css({
  	"left": left,
    "bottom": bottom
  });
  
 };
 
$(document).ready(resizeOverlay);
$(window).resize(resizeOverlay);