body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #111;
    color: #fff;
    text-align: center;
}
header {
    padding: 40px 20px;
}
.gallery {
    padding: 40px 20px;
}
footer {
    margin-top: 50px;
    padding: 20px;
    font-size: 14px;
    opacity: 0.7;
}