html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    background-color: black;
    background-image: url("../img/background.jpg");
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
}

#center {
    position: absolute;
    top:0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
}

img#title_name {
    width: 100%;
    max-width: 600px;
    margin: auto;
    top:0;
    bottom: 0;
    left: 0;
    right: 0;
    display: block;
    position: absolute;
}

#links {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 15em;
    height: 15em;
}
.logo_group {
    width: 15em;
    height: 15em;
    position: absolute;
}


img.link_icon {
    opacity: 0;
    position: absolute;
    margin: auto;
    top:0;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-width: 150px;
}