html,
body {
    height: 100%;
}

html {
    display: table;
    margin: auto;
}

body {
    display: table-cell;
    vertical-align: middle;
}

#ingresar {
    display: table-cell;
    vertical-align: middle;
    background-color: #673AB7;
    background-image: url(http://javier.app/assets/img/fincas-bg.png);
    background-attachment: fixed;
    background-size: cover;
    height: 100%;
    max-height: 100%;
    min-height: 99%;
    overflow: hidden;
    width: 100%;
}