body {
    font-family: Arial, sans-serif;
    background-color: #f9f9f9;
    margin: 0;
    padding: 0;
    color: #333;
}

header {
    text-align: center;
    background-color: #4CAF50;
    color: white;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5em;
}

header p {
    font-size: 1.2em;
    margin-top: 10px;
}

main {
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

section {
    margin-bottom: 20px;
}

h2 {
    color: #333;
    font-size: 1.8em;
    margin-bottom: 10px;
}

h3 {
    color: #555;
    font-size: 1.4em;
}

p {
    color: #555;
    margin: 10px 0;
    line-height: 1.6;
}

ol {
    margin: 10px 0;
    padding-left: 20px;
}

pre {
    background-color: #f4f4f4;
    padding: 10px;
    border-radius: 5px;
    overflow: auto;
    font-family: 'Courier New', Courier, monospace;
}

footer {
    text-align: center;
    padding: 10px;
    background-color: #333;
    color: white;
}