div.Popup.ButtonBarPopup {
    top: 33% !important;
    left: 0px !important;
    position: fixed !important;
    margin-top:-66px !important;
}

div.Popup.ButtonBarURLPopup {
    top: 33% !important;
    left: 0px !important;
    position: fixed !important;
    margin-top:-98px !important;
}