body {
    font-family: sans-serif;
    margin: 0;
    background-color: #f0f0f0;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
}

@media (max-width: 600px) {
    .container {
        margin: 10px;
    }
}