html, body {
    background-color: black;
    width: 100%;
    height: 100%;
    margin: 0;
}

canvas {
    display: block;
    margin: 0;
    padding: 0;
    position: absolute;
    left: 0;
    top: 0;
    z-index: 0;
}

a, a:visited {
    text-decoration: none;
    color: white;
}

ul.toolbar {
    color: white;
    margin: 0 auto;
    padding: 0;
    list-style: none;
    font-size: 2em;
    text-align: center;
    position: absolute;
    left: 0;
    top: 0;
    z-index: 10;
    width: 100%;
}

ul.toolbar li {
    display: inline-block;
}

ul.toolbar li a {
    display: block;
    margin: 0 .5em;
    background-color: #333333;
    padding: 1em;
}

ul.toolbar li a.selected {
    background-color: green;
}