body {
    font-family: sans-serif;
    margin: 0;
    padding: 20px;
}

header {
    background-color: #fff;
    color: #000;
    padding: 10px;
    text-align: center;
}

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

nav ul li {
    display: inline;
    margin-right: 20px;
}

nav a {
    color: #000;
    font-size:large;
    text-decoration: none;
}

main {
    margin-top: 20px;
}

.gallery img {
    width: 200px;
    height: 200px;
    margin: 5px;
    border: 1px solid #ccc;
}