body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    margin: 0;
    padding: 16px;
    background: #f2f2f2;
}

.container {
    max-width: 600px;
    margin: auto;
}

h2 {
    text-align: center;
    margin-bottom: 20px;
}

@media (min-width: 768px) {
    body {
        padding: 40px;
    }
}