JSFiddle - React, Tailwind, and code Playground

HTML

<div align="center" style="position:relative; height:137px; overflow:hidden; width:1000px; border:3px solid #ff0000;">
            <div id="gallery" style="background-color:#033; width:100px; height:137px;"></div>
          </div>
          <a href="#" onclick="an(); return false;">test</a>

JavaScript

function an(){

//$('#gallery').fadeOut();
//$('#gallery').animate({left:'-=1000'},'slow');
$('#gallery').animate({'left':'+=100px'},'slow');


}