.vertical-alignment-helper {
    display:table;
    height: 100%;
    width: 100%;
}
.vertical-align-center {
    display: table-cell;
    vertical-align: middle;
}

.horizontal-alignment-helper {
    display:table;
    height: 100%;
    width: 100%;
}

.horizontal-align-center {
    display: table-cell;
    horizontal-align: middle;
}
	
.modal-content {
    width:inherit;
    height:inherit;
    margin: 0 auto;
}