:root {
    --bg: white;
    --fg: black;
    --green: #0d3a27;
    --gold: #cc9900;
    --yellow: #ffd966;
    --highlight: darkgoldenrod;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: black;
        --fg: white;
        --highlight: var(--yellow);
    }
}
body {
    font-family: "Trebuchet MS", "Lucida Grande", sans-serif;
    font-size: 16px;
    background-color: var(--bg);
    color: var(--fg);
    margin: 0;
}
header {
    background: var(--green);
    padding: 64px 20px 20px;
    position: relative;
}
@media (min-width: 768px) {
    header {
        padding: 70px 40px 28px;
    }
}
header > img {
    float: right;
    margin-left: 10px;
    margin-bottom: 10px;
}
header > h1 {
    color: white;
}
header > p {
    line-height: 1.4;
    max-width: 400px; /* ideally two lines */
    color: var(--yellow);
    margin-bottom: 0;
}
header > ul {
    position: absolute;
    top: 16px;
    right: 16px;
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}
header > ul > li {
    position: relative;
}
header > ul a {
    text-decoration: none;
    font-weight: bold;
    padding: 6px 10px;
    color: black;
    background: var(--gold);
    display: block;
}
header > ul > li:hover > a,
header > ul > li > div > a:hover {
    background: var(--yellow);
}
header > ul > li > div {
    display: none;
    position: absolute;
    min-width: 200px;
    box-shadow:
        0 2px 5px 0 rgba(0, 0, 0, 0.16),
        0 2px 10px 0 rgba(0, 0, 0, 0.12);
}
header > ul > li:last-child > div {
    right: 0;
}
header > ul > li:hover > div {
    display: block;
}
main {
    margin: 32px 16px;
    line-height: 1.4;
}
@media (min-width: calc(960px + 32px)) {
    main {
        max-width: 960px;
        margin-left: auto;
        margin-right: auto;
    }
}
main > h2 {
    margin-top: 40px;
}
main a {
    color: var(--fg);
}
main p > code {
    color: var(--highlight);
}
main ul {
    padding-left: 24px;
}
footer {
    color: white;
    background: var(--green);
    display: flex;
    padding: 16px 20px;
    justify-content: space-between;
    align-items: center;
}
@media (min-width: 768px) {
    footer {
        padding-left: 40px;
        padding-right: 40px;
    }
}
footer > a > img {
    width: 40px;
}