:root { color-scheme: light dark; }
body {
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.5em;
    margin: 0;
}
header {
    opacity: 0.8;
    padding: 25px;
}
header h1 {
    font-size: 2em;
    margin: auto;
}
main {
    padding: 25px;
}