JSFiddle - React, Tailwind, and code Playground

HTML

<script type="text/javascript" src="http://code.jquery.com/jquery-1.6.1rc1.js"></script>
<div></div>

CSS

div{
    width:200px;
    height:200px;
    background:red;
    position:absolute;
    left:200px;
}

JavaScript

$(document).keydown(function(e) {  
    if (e.which == 37) {
        $('div').css('left', '-=10px')
    }
});