:root {
    --background-color: #121212;
    --surface-color-1: #222222;
    --surface-color-2: #444444;
    --surface-color-3: #555555;
    --text-color: #cdcdcd;
    --link-color: #4682b4ff;
    --highlight-color: #cd5c5cff;
    --max-body-width: 60rem;
}

html {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: sans-serif;

    width: 100%;
    height: 100%;
    display: flex;
    overflow-y: auto;
    justify-content: center;
}

body {
    width: min(100%, var(--max-body-width));
    display: flex;
    flex-direction: column;
    margin: 2rem;
}

body > hr {
    width: 100%;
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.icon {
    width: 1.2rem;
    height: 1.2rem;
    vertical-align: middle;
    margin: 0 0.25rem;
}

#header {
    display: flex;
    flex-direction: column;
}

#header > hr {
    width: 2.5em;
    margin-top: 1em;
    margin-bottom: 1em;
}

#title {
    margin: auto;
    font-weight: bold;
    font-size: 2em;
    color: var(--text-color);
    text-decoration: none;
}

#subtitle {
    margin: auto;
    font-weight: bold;
    font-size: 1.8em;
}

#content {
    margin-top: 2em;
    margin-bottom: 2em;
}

#footer {
    display: flex;
    justify-content: space-evenly;
    padding-bottom: 2rem;
}

@media (max-width: 40rem) {
    #footer {
        flex-direction: column;
    }
}

#footer > div {
    display: flex;
    justify-content: center;
}