body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f9f9f9;
    margin: 0;
    padding: 0;
}

header, footer {
    background-color: #4CAF50;
    color: white;
    padding: 20px;
}

main {
    padding: 20px;
    text-align: left;
}

article {
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 20px;
    margin-bottom: 20px;
}

h1, h2 {
    margin-top: 0;
}

ul {
    list-style-type: none;
    padding: 0;
}

li {
    margin-bottom: 10px;
}