html,
body {
    height: 100%;
}

body {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
    justify-content: center;
    background-color: #f5f5f5;
}

#cuadro {
    width: 100%;
    max-width: 550px;
    padding: 15px;
}

.logo_Login {
    width: 40%;
    height: auto;
}