html {
    height: 100%;
}

body {
    height: 100%;
    margin: 0 auto;
}

form {
    height: 100%;
}

.loginarea {
    background-color: white;
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translate(-50%, 0);
    width: 400px;
    height: 400px;
}

.loginuserbox {
    text-align: center;
    overflow: visible;
}

.devexcentered {
    margin: 0 auto;
    float: none !important;
    display: table;
}

@media screen and (max-width: 900px) {
    .loginuser {
        width: 100%;
    }

    .loginrowbox {
        width: 100%;
    }
}