setInterval(function() {
    console.log(document.getElementsByClassName('whatIsItLikeInsideSteve')[0].style)
    document.getElementsByClassName('whatIsItLikeInsideSteve')[0].style['background-position-x'] = parseInt(document.getElementsByClassName('whatIsItLikeInsideSteve')[0].style['background-position-x'].split('px')[0])+100+'px';
}, 10);