body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-image: url('fondopag.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: white;
}

header {
    background-color: #111;
    padding: 10px 0;
}

nav {
    display: flex;
    justify-content: center;
    gap: 30px;
}

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

nav a:hover {
    color: cyan;
}

h1 {
    color: black;
    text-align: center;
    margin-top: 20px;
}

section {
    display: none;
    text-align: center;
    padding: 20px;
}

section.active {
    display: block;
}

img {
    max-width: 400px;
    margin-top: 20px;
    border: 3px solid cyan;
}

.modelo {
    display: inline-block;
    margin: 20px;
    text-align: center;
}

.barra-globo {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: yellow;
    text-align: center;
    padding: 10px;
}