body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
    line-height: 1.6;
}
header, footer {
    background: #2c3e50;
    color: #fff;
    padding: 1rem;
    text-align: center;
}
main {
    padding: 2rem;
    max-width: 800px;
    margin: auto;
    background: #fff;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
nav a {
    color: #fff;
    margin: 0 10px;
    text-decoration: none;
}
nav a:hover {
    text-decoration: underline;
}