ruby {
    margin: 0%;
}

rt {
    font-variant-east-asian: ruby;
}

ol {
    list-style-type: none;
    counter-reset: chapter;
}

ol li {
    counter-increment: chapter;
}

ol li::before {
    content: "第" counter(chapter, japanese-informal) "章\3000";
}

p {
    text-indent: 1rem;
    margin-top: 0;
    margin-bottom: 0;
    line-height: 1.6;
}