body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 40px auto;
    line-height: 1.6;
    padding: 0 20px;
    color: #333;
    background-color: #fff;
}

h1, h2, h3 {
    color: #222;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
}

p {
    margin: 10px 0;
}

ul {
    margin: 10px 0 20px 20px;
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: #121212;
        color: #f5f5f5;
    }

    h1, h2, h3 {
        color: #ffffff;
    }

    a {
        color: #9ecbff;
    }
}