body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
}

header {
    background-color: #4CAF50;
    padding: 10px;
    color: white;
    text-align: center;
}

nav {
    background-color: #4CAF50;
    padding: 15px;
    color: white;
}

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

nav ul li {
    margin: 10px 0;
}

button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}