body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: #fff;
    padding: 20px;
}

header h1 {
    margin: 0;
}

main {
    padding: 20px;
}

article {
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h2 {
    color: #333;
}

ol {
    margin-left: 20px;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 20px;
}