body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    color: #ffffff;
}

nav {
#    background-color: #f0f0f0;
    background-color: #000000;
    padding: 10px;
}

nav a {
    margin-right: 10px;
    text-decoration: none;
}

.content {
    padding: 20px;
}

.gallery-container {
    text-align: center;
}

#gallery img {
    max-width: 80%;
    max-height: 600px;
    margin: 10px;
}

#gallery-controls button {
    margin: 5px;
}