header {
    background-color: #4CAF50;
    color: white;
    padding: 20px 0;
    text-align: center;
    font-size: 24px;
    font-weight: bold;
    border-bottom: 2px solid #ddd;
}

header h1 {
    margin: 0;
    padding-bottom: 10px;
}

header nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-size: 18px;
}

header nav a:hover {
    text-decoration: underline;
}