body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f4f4f9;
    color: #333;
    text-align: center;
}

header {
    background-color: #2c3e50;
    padding: 1.5rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header a {
    color: #ecf0f1;
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: bold;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s;
}

header a:hover {
    background-color: #34495e;
}

main {
    padding: 2rem;
}

h1 {
    color: #34495e;
}