#popup_this {
    top: 50%;
    left: 50%;
    text-align:center;
    margin-top: -200px;
    margin-left: 0px;
    position: fixed;
    padding: 0px 0px;
}

.b-close {
    position: absolute;
    left: 0;
    top: 0;
    cursor: pointer;
    color: #fff;
    padding: 2px 2px;
}