body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f9f9f9;
}
header {
    background: #111;
    color: white;
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
header .logo img {
    height: 50px;
}
nav a {
    color: white;
    margin-left: 1rem;
    text-decoration: none;
}
nav a:hover {
    text-decoration: underline;
}
main {
    padding: 2rem;
}
footer {
    text-align: center;
    padding: 1rem;
    background: #eee;
    margin-top: 2rem;
}