.mobile-masthead{
    position:relative;
    display:table;
    margin:auto;
}
.ad-btn-close{
    position: absolute;
    top:0;
    right:0;
    padding:2px 7px;
    background: rgba(255,255,255,0.80);
    font-size:20px;
    line-height:18px;
    font-weight:bold;
    cursor:pointer;
    z-index:99999999 !important;
}