.herold {
    z-index:21000000;
    position:absolute;
    top:0px;
    left:0px;
    background-color:#fff;
    width:500px;
    height:250px;
}

.ao {
    z-index:21000000;
    position:absolute;
    top:0px;
    left:0px;
    background-color:#e7e8f8;
    width:400px;
    height:600px;
}