body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: #333;
    background-color: #f4f4f4;
}

header {
    background: #333399;
    color: #333;
    padding: 10px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

nav ul li {
    display: inline;
    margin: 0 10px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 5px;
    transition: background 0.3s ease;
}

nav ul li a:hover {
    background: rgba(255, 255, 255, 0.2);
}

main {
    padding: 20px;
    text-align: center;
}

section {
    margin-bottom: 20px;
}

section h2 {
    border-bottom: 1px solid #ddd;
    padding-bottom: 5px;
    margin-bottom: 10px;
}

footer {
    text-align: center;
    padding: 10px 0;
    background: #333399;
    color: #fff;
}

footer a {
    color: #fff;
    text-decoration: none;
}