#MPConnectLoginDiv {
    display: -webkit-box;
    display: -webkit-flex;
    display: -moz-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -moz-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -moz-box-pack: center;
    -ms-flex-pack: center;        
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;    
}

#MPConnectLoginDiv iframe {
    background-color: white;       
    overflow: hidden;
    border: 1px solid Black;
    margin: auto;
    flex: 1;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    width: 400px;
    height: 400px;
    z-index: 100;
}