festa/styles/globals.css

html, body {
    padding: 0;
    margin: 0;
    font-family: sans-serif;
}

* {
    box-sizing: border-box;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0;
}

@media (prefers-color-scheme: light) {
    body {
        background-color: white;
        color: black;
    }

    h1, h2, h3, h4, h5, h6 {
        text-shadow: 1px 1px 1px white;
    }

    a {
        color: #4444ff;
    }

    a:visited {
        color: #aa44ff;
    }
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: black;
        color: white;
        text-shadow: 1px 1px 1px black;
    }

    h1, h2, h3, h4, h5, h6 {
        text-shadow: 2px 2px 2px black;
    }

    a {
        color: #8888ff;
    }

    a:visited {
        color: #aa88ff;
    }
}