body {
    background-color: #222;
    width: 90%;
    max-width: 1000px;
    margin: auto;
}
p, h1, h2, h3, h4, li, summary, th, td {
    color: #eee;
}
a, span {
    font-weight: 700;
    color: #91ee91;
}
div {
    text-align: center;
}