nav a {
    text-decoration: none;
}

header {
    margin: 0;
    padding: 10px 10px;
    background-color: #eee;
    color: #000;
    font-size: 30px;
}

header a {
    padding: 10px 10px;
    text-decoration: none;
    color: #17a;
    font-size: 40px;
}

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

@media(prefers-color-scheme: dark) {
    html {
        color: #A9AEB5;
        background-color: #232629;
    }
    a {
        color: #84AEE6;
    }
    header {
        background-color: #1D2024;
        color: #CDD5E1;
    }
    header a {
        color: #3EB4EE;
    }
}