.layer_ad {
    position: absolute;
    padding: 3px;
    background-color: white;
    border: 1px solid #dadada;
}
.layer_ad .close {
    width: 100%;
    text-align: right;
    padding-top: 3px;
}
.layer_ad .close {
    margin: 0 auto;
    text-align: right;
    line-height: 32px;
    background-color: white;
}
.layer_ad .close button {
    width: 42px;
    height: 23px;
    overflow: hidden;
    text-indent: -5000em;
    border: none;
}
.layer_ad .close a {
    display: inline-block;
    width: 42px;
    height: 23px;
    line-height: 23px;
    background: #9f9f9f;
    text-align: center;
    color: #fff;
    vertical-align: middle;
    margin-left: 10px;
}