html, body {
    padding: 0;
    margin: 0;
    height: 100%;
    background-color: #0C2A67;
}

body {
    background: url("img/background.jpg") no-repeat top center;
    background-size: cover;
}

body > div {
    height: 100%;
    background: url("img/logo.png") no-repeat center;
    background-size: 50%;
}

@media only screen and (max-width: 425px) {
    body > div {
        background-size: 90%;
    }
}