body {
    background: #111;
    color: white;

    font-family: Arial, sans-serif;

    max-width: 800px;
    margin: 100px auto;
    padding: 20px;
}

h1 {
    font-size: 48px;
}

button {
    padding: 12px 20px;
    font-size: 18px;
    cursor: pointer;
}