body{margin:0;padding:0;background:#000}canvas{z-index:-1;height:100%}#controllers,canvas{position:fixed;top:0;left:0;width:100%}#controllers{z-index:1;text-align:center;padding:10px}.button{border:none;background:#fff;color:#000;padding:8px 20px;border-radius:15px;cursor:pointer;outline:none;margin:5px;font-family:sans-serif}