body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 1em 0;
    text-align: center;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5em;
}

nav a:hover {
    background-color: #3e8e41;
}

main {
    padding: 2em;
}

footer {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 1em 0;
    position: fixed;
    width: 100%;
    bottom: 0;
}