.header {
    background-color: #007BFF;
    color: white;
    padding: 10px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin: 0;
}

.header nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
}

.header nav ul li {
    margin: 0 15px;
}

.header nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

.header nav ul li a:hover {
    color: #FFD700;
}