body {
    margin: 0;
}

header {
    display: block;
    max-width: 80vw;
    margin: 2ch auto 0 auto;
    position: relative;

    text-align: center;
    font-size: 2rem;
}

contributor {
    display: block;
    max-width: 90vw;
    margin: 0 auto;
    position: relative;

    text-align: center;
    font-size: 1rem;
}

content {
    display: block;
    margin: 0 auto;
    position: relative;

    text-align: justify;
    font-size: 1.2rem;
    line-height: 2.2ch;
}