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

header {
    background-color: #004080;
    padding: 20px 0;
    text-align: center;
    color: white;
}

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

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    text-decoration: none;
    color: white;
    font-size: 18px;
    padding: 8px 12px;
    transition: background 0.3s;
}

nav ul li a:hover {
    background-color: #575757;
    border-radius: 5px;
}

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

footer {
    background-color: #004080;
    color: white;
    text-align: center;
    padding: 15px 0;
    position: relative;
    bottom: 0;
    width: 100%;
}