body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    margin: 0;
}

header {
    background-color: #004080;
    color: white;
    padding: 10px;
    text-align: center;
}

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

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

nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

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

section {
    background-color: white;
    margin: 15px;
    padding: 20px;
    border-radius: 8px;
}

.img-resp {
    max-width: 100%;
    height: auto;
}

iframe {
    width: 100%;
    max-width: 560px;
    height: auto;
    display: block;
    margin: 20px auto;
}

footer {
    background-color: #004080;
    color: white;
    text-align: center;
    padding: 10px;
    margin-top: 20px;
}