body {
    font-family: sans-serif;
    line-height: 1.6;
    margin: 0 auto;
    padding: 0;
    background: #f9f9f9;
    color: #333;
    max-width: 900px;
}

header, footer {
    background-color: #2c3e50;
    color: white;
    padding: 1em;
    text-align: center;
}

main {
    padding: 2em;
    max-width: 800px;
    margin: auto;
    background: white;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1 {
    font-size: 1.8em;
    margin-bottom: 0.5em;
}

h2 {
    color: #2c3e50;
    margin-top: 1.5em;
}

code {
    background: #eee;
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-family: monospace;
}