body {
    font-family: Arial, sans-serif;
    background: #f5f5f5;
    color: #333;
    margin: 0;
    padding: 0;
}
header {
    background: #2e7d32;
    color: white;
    padding: 20px 0;
    text-align: center;
}
nav ul {
    list-style: none;
    padding: 0;
}
nav ul li {
    display: inline;
    margin: 0 15px;
}
main {
    padding: 20px;
}
footer {
    background: #2e7d32;
    color: white;
    text-align: center;
    padding: 10px 0;
}