JSFiddle - React, Tailwind, and code Playground

HTML

<div id="gallery">
<!-- Thumbnails Container -->
<div id="thumbnails">
    <img src="http://brit-asian.com/wp-content/uploads/2012/05/kim-kardashian13.jpg" class="thumb" />
</div>

</div>

CSS

.thumb{width:35px;height:35px;cursor:pointer;}

JavaScript

$('.thumb').hover(function(){
    $('#gallery').append('<div id="preview"></div>');
    $('#preview').append('<img src="'+$(this).attr('src')+'" />');
    },
    function(){
        $('#preview').remove();
    }
);