body{margin:0;background-color:#000}#container{text-align:center;position:absolute;left:0;right:0;top:50%;transform:translateY(-50%)}.fondoHumo{background-color:#000c;position:absolute;width:100%;height:100%;z-index:-2000;top:0;left:0}.fondoladrillo{margin-top:100px;background-color:#000c;position:absolute;z-index:-2000;top:0;left:0}.fondotoque1{margin-top:100px;background-color:#000c;background-size:cover;position:absolute;width:100%;height:100%;z-index:-2000;top:0;left:0}.fondorider{background-color:#000c;background-size:cover;position:fixed;width:100%;height:100%;z-index:-2000;top:0;left:0}