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

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

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

header ul li {
    display: inline;
    margin-right: 15px;
}

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

main {
    padding: 2rem;
}