body {
    font-family: Arial, sans-serif;
    background: #f5f5f5;
    padding: 30px;
}

nav a {
    margin-right: 15px;
    text-decoration: none;
    font-weight: bold;
}

form {
    background: #ffffff;
    padding: 20px;
    max-width: 420px;
}

.error {
    color: #c00;
}

.success {
    color: #090;
}