body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #111;
    color: #fff;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 80px 24px;
}

h1 {
    font-size: 4rem;
}

button {
    padding: 12px 20px;
    cursor: pointer;
}