body {
    background-image: initial;
}

#logo {
    width: 100%;
}

#logo img {
    display: none;
}

#logo a {
    display: block;
    margin: 15px auto 0;
    width: 120px;
    height: 120px;
    background-image: url('https://flashii.net/user-assets.php?u=9&m=avatar');
    background-size: 120px;
}

#center {
    font-size: 0.1em;
}

#err {
    font-size: 10em;
}