JSFiddle - React, Tailwind, and code Playground
HTML
<body>
<div>
<button class="change">preview<input type="hidden" value="http://pngimg.com/upload/tree_PNG2517.png"/></button>
</div>
</body>
JavaScript
$('.change').on('click', function(){
$(document.body).css('background', 'url('+$(this).find('input').val()+')');
});