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

header {
    text-align: center;
    padding: 40px 20px;
    background-color: #f5f5f5;
}

nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    padding: 15px;
    background-color: #fff;
    border-bottom: 1px solid #ddd;
}

nav a {
    text-decoration: none;
    color: #333;
}

main {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}

footer {
    text-align: center;
    padding: 20px;
    color: #999;
}