body {
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    background: #f0f0f0;
}
header {
    background: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
}
nav a {
    color: #ffcc00;
    margin: 0 10px;
    text-decoration: none;
}
main {
    padding: 20px;
}
img {
    max-width: 100%;
    height: auto;
    margin: 10px 0;
}
footer {
    background: #333;
    color: #fff;
    padding: 10px;
    text-align: center;
}