body {
    font-family: 'Segoe UI', 'Helvetica Neue', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
    background-color: #fff8f0;
    color: #333;
    margin: 0;
    padding: 20px;
}
h1 {
    text-align: center;
}
.subtitle {
    text-align: center;
    font-style: italic;
    margin-bottom: 30px;
}
.chapter-list {
    list-style-type: none;
    padding: 0;
}
.chapter-list li {
    margin: 10px 0;
}
a {
    color: #3366cc;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}
.next-button {
    display: inline-block;
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #3366cc;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
}
.next-button:hover {
    background-color: #254a99;
}