html {
    width: 100%;
    height: 100%;
    background-color: black;
}

body {
    width: 100%;
    height: 100%;
    margin: 0px;
}

div.container {
    max-height:100%;
    margin: auto;
    width: 100%;
    height: 100%;
}

img.logo {
    width: 50%;
    position: absolute;
    margin: auto;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    mix-blend-mode: difference;
}