header {
    background-color: #f1f1f1;
    padding: 20px 0;
    text-align: center;
    font-family: Arial, sans-serif;
}

header ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

header ul li a {
    text-decoration: none;
    color: #0073e6;
}

header ul li a:hover {
    text-decoration: underline;
}