JSFiddle - React, Tailwind, and code Playground

HTML

<!-- Nějaké náhodné loga z 4chanu -->
<img class="obrazek" src="https://s.4cdn.org/image/title/246.gif">
<img class="obrazek" src="https://s.4cdn.org/image/title/34.gif">

<img id="big_image" src="#">

CSS

#big_image { display: none; position: absolute; right:0; top:0; }
.obrazek { width: 100px }

JavaScript

$(".obrazek")
  .mouseenter(function() {
    $("#big_image").attr("src", $(this).attr("src"));
    $("#big_image").show();
  })
  .mouseleave(function() {
    $("#big_image").hide();
  });