body {
    width: 100%;
    margin: 0;
    padding: 0;
    border: 0;
}

menu.top {
    display: flex;
    padding: 0;
    margin: 0;

    flex-direction: row;
    justify-content: space-between;
}

menu.top>* {
    margin: 10px;
    display: inline-block;
}

main {
    margin: 10px;
}

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

    a {
        color: cyan;
    }

    a:visited {
        color: magenta;
    }
}