html {
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    background-color: black;
}

body {
    font-family: sans-serif;
    font-weight: 200;
    color: white;
    font-size: 40px;
    margin: 0;
}

#image-container img {
    position: absolute;
    z-index: 1;
    max-width: 100%;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin:auto;
}

#image-container img.top {
    position: absolute;
    z-index: 2;
}

#navigation {
    position: absolute;
    z-index: 20;
    right: 20px;
    bottom: 20px;
}

.button {
    float: left;
    border: 3px solid white;
    margin: 10px;
    padding: 10px;
    padding-left: 20px;
    padding-right: 30px;
    background-color: rgba(0, 0, 0, 0.6);
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    cursor: pointer;
}

.button.active {
    background-color: rgba(255, 255, 255, 0.8);
    color: black;
    border-color: black;
}