body {
    font-family: Arial, sans-serif;
    text-align: center;
    padding: 50px;
    background-color: #f9f9f9;
}
h1 {
    color: #333;
}
.intro-ja, .intro-en {
    margin-top: 20px;
    font-size: 16px;
    line-height: 1.8;
    text-align: center;
}