body {
    font-family: 'Times New Roman', Times, serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 1em 0;
    text-align: center;
}

main {
    padding: 20px;
    max-width: 800px;
    margin: auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

section {
    margin-bottom: 20px;
}

h1, h2 {
    color: #333;
}

pre {
    background: #f8f8f8;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    overflow-x: auto;
}