.alert .glyphicon
{
    display: table-cell;
    padding-right: 10px;
}

.alert div
{
    display: table-cell;
}

.modal-dialog-centered
{
    position: absolute;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    -ms-transform: translate(-50%, -50%) !important;
    -webkit-transform: translate(-50%, -50%) !important;
}