body {
    font-family: Arial;
    background: #f4f4f4;
}

nav {
    background: #333;
    padding: 10px;
}

nav a {
    color: white;
    margin-right: 10px;
    text-decoration: none;
}

.container {
    padding: 20px;
}

button {
    padding: 5px 10px;
}