body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

header {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 1rem;
}

nav ul {
    list-style: none;
    padding: 0;
}

nav ul li {
    display: inline;
    margin: 0 1rem;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
}

main {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

article {
    margin-bottom: 2rem;
}

footer {
    text-align: center;
    padding: 1rem;
    background: #f4f4f4;
}