.login-page {

    background:
    linear-gradient(
        rgba(0,0,0,.65),
        rgba(0,0,0,.65)
    ),
    url('../img/fondo_alumni.png');

    background-size: cover;

    background-position: center;

}

.login-box {

    width: 420px;

}

.card {

    border-radius: 15px;

    box-shadow: 0 10px 25px rgba(0,0,0,.25);

}