JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div{

    height:200px;
    background:red;
    position:absolute;
    left:200px;
}

JavaScript

$(document).keydown(function(e) {
    var moveBy;

    switch (e.which) {

    case 65: // a
        moveBy = -10;
        break;
    case 68: // ds
        moveBy = 10;
        break;
    }
    $('div').css('left', function() {
        var l = parseInt($(this).css("left"));
        $(this).css("left", (l + moveBy) + "px");
    });
});