body {
    font-family: Arial, sans-serif;
    background: #f8f8f8;
    margin: 0;
    padding: 0;
    color: #333;
}

header {
    background: #0077cc;
    color: white;
    text-align: center;
    padding: 20px;
}

main {
    max-width: 900px;
    margin: auto;
    padding: 20px;
    background: white;
}

h1, h2 {
    color: #0077cc;
}

ul {
    list-style: disc;
    margin-left: 20px;
}

pre {
    background: #eee;
    padding: 10px;
    overflow-x: auto;
    border-left: 5px solid #0077cc;
}

a {
    color: #0077cc;
}

footer {
    background: #222;
    color: white;
    text-align: center;
    padding: 10px;
    margin-top: 20px;
}