:root {
    --background-color: white;
    --foreground-color: black;
    --link-color: royalblue;
}

@media (prefers-color-scheme: dark) {
:root {
    --background-color: black;
    --foreground-color: white;
    --link-color: skyblue;
}
}

html {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;

    margin: 0;
    min-height: 100%;

    background-color: var(--background-color);

    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    text-align: center;
    color: var(--foreground-color);
}

a:link, a:visited {
    text-decoration: none;

    color: var(--link-color);
}

a:hover, a:active {
    text-decoration: underline;
}

footer {
    margin: 16px 0;
}

.secondary {
    color: slategray;
}

.content {
    flex: 1;

    margin: 8px;
}