:root {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    display: flex;
    justify-content: center;
}

body {
    max-width: 640px;
}

header h1 {
    margin-bottom: 0;
}

header p {
    margin-top: 4px;
}

body.center {
    text-align: center;
}

.pbar {
    width: 100%;
    height: 16px;
    border: 1px solid white;
    background-color: black;
}

.pbar .pdone {
    height: 100%;
    background-color: green;
}

main.list .defined a {
    color: green;
}

main.list .defined span {
    color: #010;
}

main.list .undefined a {
    color: darkred;
}

main.list .undefined span {
    color: #100;
}

footer>.row {
    justify-content: space-between;
}

.row {
    display: flex;
}

@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;
    }

    main.list .defined a {
        color: lime;
    }

    main.list .defined span {
        color: #bfb;
    }

    main.list .undefined a {
        color: red;
    }

    main.list .undefined span {
        color: #fdd;
    }
}