body {
    margin: 0;
    background-color: #fff;
}

* {
    box-sizing: border-box;
}

#logo {
    width: 100%;
    box-sizing: border-box;
    text-align: center;
}

#logo img {
    width: auto;
    height: auto;
    max-width: 80%;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
}